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Defense Tech & Space Accelerators
Six valuable programs for foundersPublished · By DefDex
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Short answer
Which defense tech accelerators should founders apply to?
Six defense tech accelerators to know are Y Combinator (YC), Black Flag, the Orbital Edge Accelerator, NATO DIANA, the Techstars Space Accelerator and Starburst Aerospace. YC invests $500,000, Black Flag $250,000 to $1 million and Techstars $220,000. NATO DIANA gives €100,000 in contractual funding. Orbital Edge raises $500,000 to $750,000 per startup, and Starburst does not publish terms.
Key takeaways
- Y Combinator invests $500,000: $125,000 on a post-money SAFE for 7% plus $375,000 on an uncapped MFN SAFE.
- Black Flag, a virtual accelerator managed by Harpoon Ventures with In-Q-Tel and Shield Capital, invests $250,000 to $1 million with valuation and terms set per company.
- NATO DIANA gives each selected company €100,000 in contractual funding and a six-month programme; its annual challenge call opens in June.
- The Techstars Space Accelerator, run with the U.S. Space Force and NASA's Jet Propulsion Laboratory, invests $220,000 in a three-month program in Los Angeles.
- Starburst Aerospace does not publish investment terms on its accelerator pages, and each of its programs sets its own eligibility.
Which Defense Tech Accelerator Fits Your Company?
| Program | Run by | Where |
|---|---|---|
 | Y Combinator | San Francisco, California (in person) |
 | Harpoon Ventures | Virtual |
 | ISS National Laboratory (managed by CASIS) | Multi-city events (2026: Anchorage, Houston, Washington D.C., Boston, Los Angeles; Demo Day in San Francisco) |
 | NATO Defence Innovation Accelerator for the North Atlantic (DIANA) | 16 accelerator sites in NATO countries, including MassChallenge in the United States |
 | Techstars, in partnership with the U.S. Space Force and NASA's Jet Propulsion Laboratory | Los Angeles, California |
 | Starburst Aerospace | Multi-site (United States, France, Israel, Germany, Spain, Singapore and others) |
Y Combinator
Y Combinator
Y Combinator (YC) is a startup accelerator that invests in early-stage companies across sectors and runs a roughly three-month batch program in San Francisco.
What you get
- $500,000 total: $125,000 on a post-money SAFE (simple agreement for future equity) for 7%, plus $375,000 on an uncapped MFN (most favored nation) SAFE.
- The MFN SAFE converts on the terms of the lowest-cap SAFE issued during the MFN window.
- Pro rata right to invest in later rounds; YC charges no fees to participate.
- Winter 2027 batch runs January to March, in person on the YC campus.
- Who it’s for
- Early-stage founders in any sector; YC incorporates companies in the US, Canada, Cayman and Singapore.
- Defense angle
- YC's Fall 2026 Requests for Startups include "The Future of American Defense", covering low-cost interceptors, drones, resilient logistics and advanced manufacturing.
- How to apply
- Winter 2027 applications are open; the on-time deadline is November 2 at 8pm PT, with decisions by December 11. Founders can also apply now to future Spring, Summer and Fall batches.
- Where
- San Francisco, California (in person)
Sources: YC: The YC Deal · YC: Apply · YC: Requests for Startups
Black Flag
Harpoon Ventures
Black Flag is a virtual accelerator program managed by Harpoon Ventures, run in collaboration with In-Q-Tel (IQT) and Shield Capital, for early-stage companies building technology relevant to national security.
What you get
- $250,000 to $1 million invested by Harpoon Ventures; valuation and terms are set per company.
- Applications are shared with Shield Capital and IQT, which review separately and may invest more on their own terms.
- Mentors, go-to-market support, guidance on capture and proposal strategy for non-dilutive government funding, and partner credits including Palantir AIP and Foundry.
- Who it’s for
- Pre-seed and seed companies; Black Flag says applicants do not need to be defense tech startups and accepts energy, robotics, AI, cybersecurity, manufacturing, space, biology and autonomy companies.
- Defense angle
- The program is built around national security, with an emphasis on government access and mentors from defense companies and the military.
- How to apply
- Rolling applications, reviewed monthly; the site shows a countdown to the next batch close.
- Where
- Virtual
Sources: Black Flag: home page and FAQ
Orbital Edge Accelerator
ISS National Laboratory (managed by CASIS)
The Orbital Edge Accelerator is a space-startup accelerator run by the International Space Station (ISS) National Laboratory with venture investment partners. It combines private capital with access to research in low Earth orbit.
What you get
- $500,000 to $750,000 in private capital per startup in the 2026 cohort, from investors including Cook Inlet Region, Inc., E2MC, Stellar Ventures, Context Ventures, Draper Associates and Draper University.
- Chance to win the Boeing-sponsored Technology in Space Prize: up to $100,000 in non-dilutive funding.
- Invitation to propose research on the ISS, with the ISS National Lab sponsoring launch, return and astronaut time.
- A multi-month program of virtual and in-person coaching ending in a Demo Day (San Francisco, December 2026).
- Who it’s for
- The Sentinel Track takes early-stage startups building space technologies with dual-use potential; the Disrupt Track takes pre-seed and seed startups in space biotechnology and advanced materials.
- Defense angle
- The Sentinel Track is explicitly for space technologies with dual-use (commercial and defense) applications.
- How to apply
- Annual cohort; the 2026 application period is closed and the next cycle's dates are not yet published.
- Where
- Multi-city events (2026: Anchorage, Houston, Washington D.C., Boston, Los Angeles; Demo Day in San Francisco)
Sources: Orbital Edge Accelerator: home · Orbital Edge Accelerator: About · ISS National Lab: Eight startups selected for Orbital Edge (Aug 12, 2026)
NATO DIANA Challenge Programme
NATO Defence Innovation Accelerator for the North Atlantic (DIANA)
The Defence Innovation Accelerator for the North Atlantic (DIANA) is NATO's accelerator. It selects companies through annual challenge calls and puts them through an accelerator programme aimed at adoption by Allied forces.
What you get
- €100,000 in contractual funding for each selected innovator during the Accelerator Programme.
- A six-month accelerator programme, delivered at one of 16 accelerator sites across the Alliance, mixing in-person and online support.
- Access to more than 200 test centres for testing, evaluation, validation and verification.
- Down-selected companies can enter the Mission Track for up to €300,000 more to demonstrate and transition their solution.
- Who it’s for
- Companies from NATO countries with solutions at technology readiness level (TRL) 4 or above; universities and non-profits are not eligible, and start-ups and SMEs with little defence experience benefit most.
- Defense angle
- Challenges are set from NATO and Allied priorities; the 2027 areas are human survivability, uncrewed-system autonomy, multidomain sensing, operational resilience in contested environments, responsive logistics, and air-defence countermeasures.
- How to apply
- One annual challenge call opens in June; the 2027 call closed 3 July 2026, and selected innovators start in January 2027. DIANA also runs Dynamic Challenges during the year for urgent needs; these do not include the Accelerator Programme.
- Where
- 16 accelerator sites in NATO countries, including MassChallenge in the United States
Sources: NATO DIANA: Challenges · NATO DIANA: Accelerator Programme · NATO DIANA unveils six new challenges (Jun 1, 2026)
Techstars Space Accelerator
Techstars, in partnership with the U.S. Space Force and NASA's Jet Propulsion Laboratory
The Techstars Space Accelerator is a three-month Techstars program for space technology companies, run in partnership with the U.S. Space Force and NASA's Jet Propulsion Laboratory (JPL). It is still running: the Fall 2026 class started on September 8, 2026.
What you get
- Standard Techstars investment of $220,000: $20,000 through a convertible equity agreement for 5% common stock, plus $200,000 through an uncapped MFN (most favored nation) SAFE.
- Three months of mentorship-driven support, ending in a Demo Day (December 10, 2026 for the current class).
- Work with aerospace partners on market positioning, customer acquisition and product development; no fee to join.
- Who it’s for
- Space technology companies working across terrestrial, low Earth orbit (LEO), geostationary orbit (GEO) and lunar domains, plus companies from adjacent industries using aerospace as a primary go-to-market channel.
- Defense angle
- The program explicitly targets dual-use companies and partners with the U.S. Space Force; the Fall 2026 class includes defense-focused companies.
- How to apply
- Annual fall cohort. For 2026, applications opened March 2 and closed June 10. Dates for the next cohort are not yet posted. Techstars' older Starburst Space Accelerator page now shows this program.
- Where
- Los Angeles, California
Sources: Techstars Space Accelerator · Techstars: Introducing the Fall 2026 Accelerator Class (Sep 8, 2026) · Techstars: Accelerator investment terms
Starburst Aerospace accelerators
Starburst Aerospace
Starburst runs accelerator programs for aerospace, space, aviation and defense startups, often with corporate or government partners. It lists more than 60 corporate partners.
What you get
- Programs differ by partner and length, for example: Innovation Corridor Defense Accelerator (ICDA), 3 months in San Marcos, Texas; SEISMIC MSI Defense Technology Accelerator, 6 weeks in the US; Starburst Accelerator, 3 months in Paris; Flagship Accelerator, 12 months, global.
- Pitch to Starburst and its corporate partners, then join the program; support includes market research, government resources, networking and marketing.
- Investment terms are not published on Starburst's accelerator pages.
- Who it’s for
- Aerospace and defense startups from ideation to growth stage; each program sets its own eligibility.
- Defense angle
- Several programs focus on defense, including ICDA, the SEISMIC MSI Defense Technology Accelerator and the EUDIS Business Accelerator in Europe.
- How to apply
- Program by program: pick a program, apply on its website, then pitch privately or to a selection committee. EUDIS Business Accelerator Cohort 4 applications opened in October 2026.
- Where
- Multi-site (United States, France, Israel, Germany, Spain, Singapore and others)
Sources: Starburst: Accelerator program · Starburst: Startup programs
Checked against each program’s own pages on Oct 12, 2026. Terms and deadlines change; confirm on the official site before applying.
Frequently Asked Questions
How much does YC invest?
Y Combinator (YC) invests $500,000 in total: $125,000 on a post-money SAFE (simple agreement for future equity) for 7%, plus $375,000 on an uncapped MFN (most favored nation) SAFE. The MFN SAFE converts on the terms of the lowest-cap SAFE issued during the MFN window. YC also gets a pro rata right to invest in later rounds and charges no fees to participate.
Does Y Combinator fund defense startups?
Yes. Y Combinator's Fall 2026 Requests for Startups include "The Future of American Defense", covering low-cost interceptors, drones, resilient logistics and advanced manufacturing, and YC invests in early-stage companies in any sector. The Winter 2027 batch runs January to March in person in San Francisco. The on-time application deadline is November 2 at 8pm PT, with decisions by December 11.
Does Black Flag take equity?
Black Flag has no fixed terms: Harpoon Ventures invests $250,000 to $1 million per company, with valuation and terms set per company. Applications are also shared with Shield Capital and In-Q-Tel (IQT), which review separately and may invest more on their own terms. Black Flag is a virtual program for pre-seed and seed companies, and it reviews rolling applications monthly.
What is NATO DIANA?
NATO DIANA (Defence Innovation Accelerator for the North Atlantic) is NATO's accelerator. It selects companies through an annual challenge call that opens in June and gives each selected innovator €100,000 in contractual funding during a six-month programme at one of 16 accelerator sites, plus access to more than 200 test centres. Down-selected companies can enter the Mission Track for up to €300,000 more.
Who can apply to NATO DIANA?
Companies from NATO countries with solutions at technology readiness level (TRL) 4 or above can apply to NATO DIANA (Defence Innovation Accelerator for the North Atlantic). Universities and non-profits are not eligible, and start-ups and SMEs with little defence experience benefit most. The 2027 call closed 3 July 2026, and selected innovators start in January 2027.
How much does the Techstars Space Accelerator invest?
The Techstars Space Accelerator invests the standard Techstars $220,000: $20,000 through a convertible equity agreement for 5% common stock, plus $200,000 through an uncapped MFN (most favored nation) SAFE. The three-month program in Los Angeles runs in partnership with the U.S. Space Force and NASA's Jet Propulsion Laboratory (JPL), has no fee to join, and takes an annual fall cohort.
Are there accelerators for space startups?
Yes. The Techstars Space Accelerator in Los Angeles runs a three-month program with the U.S. Space Force and NASA's Jet Propulsion Laboratory (JPL). The Orbital Edge Accelerator, run by the International Space Station (ISS) National Laboratory, offered $500,000 to $750,000 in private capital per startup in its 2026 cohort, plus an invitation to propose ISS research. Its Sentinel Track is for dual-use space technologies.
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