
AN/SPY-1
Multifunction phased-array radar used by Aegis-equipped warships.
- Milestone
- 1973
Photo: Photo by RoyKabanlit via Wikimedia Commons · CC BY-SA 4.0

Program · United States
Integrated naval combat management and weapon control system.
RCA receives Aegis engineering development contract
RCA was contracted to design and develop Aegis Mk 7 Engineering Development Model 1. This dates the contract rather than a public unveiling.
Engineering model undergoes sailor-operated land test
Sailors operated and maintained the engineering model during a two-day land-based FAST CRUISE operational test before its transfer to USS Norton Sound.
Aegis engineering model intercepts drone targets at sea
Aegis EDM-1 aboard USS Norton Sound intercepted two drone aircraft targets during its initial missile engagement. Earlier land tests prevent treating this as the first hardware test.
First Aegis ship enters service
USS Ticonderoga was commissioned and deployed in 1983; no public-unveil date is established here.
Japan joins the Aegis fleet
Japan’s Self-Defense Forces became an Aegis operator in 1993; the source supports year precision.
Republic of Korea joins the Aegis fleet
South Korea joined the international Aegis fleet with the commissioning of Sejong the Great.
Aegis BMD 4.0.1 completes first successful intercept
USS Lake Erie completed the first successful live-fire intercept by the second-generation Aegis BMD 4.0.1 system with an SM-3 Block IB. The event date uses Hawaii local time.
Baseline 9.C1 demonstrates integrated air and missile defense
USS John Paul Jones used Baseline 9.C1 in the first live-fire test of Aegis IAMD Radar Priority Mode, engaging ballistic and cruise-missile targets nearly simultaneously.
Aegis Ashore completes first intercept test
The land-based Aegis test complex in Hawaii conducted its first intercept flight test. The event occurred December 9 Hawaii time; the release was published December 10.
Aegis Ashore enters service in Romania
The U.S. Aegis Ashore installation in Deveselu became operational in 2016. It is a U.S. deployment hosted in Romania, not a Romanian export sale.
Aegis BMD demonstrates intercept of ICBM-class test target
USS John Finn and an SM-3 Block IIA intercepted an ICBM-representative target in the FTM-44 developmental test near Hawaii. This records a demonstration, not a declaration of operational capability.
NATO announces Poland Aegis Ashore site mission-ready
NATO announced that the U.S. Aegis Ashore site in Redzikowo was operational and available to defend the Alliance. The date records NATO’s announcement, not an inferred first operational day.
Aegis Guam completes first local ballistic intercept test
The Aegis Guam configuration participated in FEM-02, intercepting a ballistic test target. This was a developmental demonstration supporting the future Guam Defense System.
Stellar Banshee demonstrates tracking and simulated engagement
USS Pinckney tested Sea Based Terminal Increment 3 in FTX-40 against a hypersonic representative target. The engagement was simulated; this entry does not record a live intercept.
Japan ASEV integration completes two live-target tracking events
JFTX-01 events on March 17 and 19 tested SPY-7 integrated with the Aegis Weapon System. Both ended in virtual engagements; the date records completion of this two-event test.
Program and variant milestones. Dates show only the precision the sources give.
Aegis AshoreVariants of this program. Their unit costs, quantities and operating costs are in the cost table below.
| Measure | Variant | Amount | Source |
|---|---|---|---|
| Program totals · 4 | |||
| Aegis BMD annual RDT&E referenceR-1 PE0603892C Aegis BMD. Annual appropriation scope, not lifetime development cost. FY2026 includes the listed reconciliation spend plan; FY2027 includes discretionary and mandatory requests where present. Shared program scope; cannot be attributed solely to this product. | Aegis Ashore | $927.87M / yrNominal $; source budget basis | FY2027 R-1: Research, Development, Test & Evaluation Department of Defense Comptroller · Apr 2026 · figure FY2027 total request · PB2027 |
| CBO modeled complete site acquisitionHypothetical site with launchers, interceptors and support equipment. Different scope from the deckhouse-and-radar headline; not the cost paid for either European site. | Aegis Ashore | $3.945BConstant 2026 $ · modeled | Costs of a Notional National Missile Defense System (2026 testimony) Congressional Budget Office · figure CBO 2026 notional architecture |
| R&D program total1 | All | Not established | — |
| R&D program total1 | Aegis Ashore | Not established | — |
| Unit costs · 3 | |||
| Contract unit priceNavy contract to Lockheed Martin to produce three Aegis Weapon Systems for the 60th-62nd Arleigh Burke-class destroyers: $208.7M / 3 = $69.57M per shipset (Aegis Weapon System production only; excludes shipyard integration and missiles). | All | $69.567MThen-year $ · 3 units | U.S. Navy Awards $208.7 Million to Lockheed Martin for Three Aegis Weapon Systems Lockheed Martin · Jan 31, 2005 |
| CBO modeled deckhouse + SPY-6 radarCBO Table 3 includes deckhouse and radar only. It does not price the complete site or the existing SPY-1-based European configuration. Modeled acquisition cost, not an actual contract, paid price or approved purchase. | Aegis Ashore | $650MConstant 2026 $ · modeled | Costs of a Notional National Missile Defense System (2026 testimony) Congressional Budget Office · figure CBO 2026 notional architecture |
| Comparable unit priceNo comparable standalone unit price was established; package or contract totals are shown separately. | All | Not established | — |
| Quantities · 4 | |||
| European U.S. sitesRomania and Poland; excludes the Hawaii test facility. Site count, not interceptor inventory or foreign ownership. | Aegis Ashore | 2U.S. only; stated source scope | Aegis Ashore Poland completes first maintenance availability U.S. Navy / NAVSEA · 2024 |
| U.S. inventoryA current U.S. inventory was not established. Annual procurement, cumulative deliveries and production capacity are not a stockpile count. | All | Not established | — |
| U.S. procurement quantity2 | All | Not established | — |
| U.S. procurement quantity2 | Aegis Ashore | Not established | — |
| Operating costs · 2 | |||
| CBO modeled full-site annual O&SHypothetical complete site, not observed spending at Romania or Poland. Broader scope than the headline deckhouse-and-radar estimate. | Aegis Ashore | $169M / yrConstant 2026 $ · modeled | Costs of a Notional National Missile Defense System (2026 testimony) Congressional Budget Office · figure CBO 2026 notional architecture |
| Annual operations & supportA complete, system-specific annual operating and support cost was not established. Procurement, replacement rounds and contract support are different measures. | All | Not established | — |
1A lifetime program R&D total was not established. Development contracts and shared program budgets are not substituted for that total.
2No comparable U.S. procurement quantity was established in this review.
Superseded estimates and prices, each in its original scope and dollar basis.
| Measure | Variant | Amount | Source |
|---|---|---|---|
| Aegis BMD engineering contract ceilingTen-year mixed engineering and sustainment scope; not lifetime R&D or obligated spending. | All | $2.968BNominal $; source budget basis | Contracts for July 1, 2025: Aegis BMD engineering agent U.S. Department of Defense · figure Jul 1, 2025 |
| Aegis BMD annual RDT&E reference1 | Aegis Ashore | $653.64M / yrNominal $; source budget basis | FY2027 R-1: Research, Development, Test & Evaluation Department of Defense Comptroller · Apr 2026 · figure FY2025 actual · PB2027 |
| Aegis BMD annual RDT&E reference1 | Aegis Ashore | $550.988M / yrNominal $; source budget basis | FY2027 R-1: Research, Development, Test & Evaluation Department of Defense Comptroller · Apr 2026 · figure FY2026 total enacted / spend plan · PB2027 |
| Aegis BMD annual RDT&E reference1 | Aegis Ashore | $927.87M / yrNominal $; source budget basis | FY2027 R-1: Research, Development, Test & Evaluation Department of Defense Comptroller · Apr 2026 · figure FY2027 total request · PB2027 |
1R-1 PE0603892C Aegis BMD. Annual appropriation scope, not lifetime development cost. FY2026 includes the listed reconciliation spend plan; FY2027 includes discretionary and mandatory requests where present. Shared program scope; cannot be attributed solely to this product.
| Fiscal year | Appropriation | Request | Enacted | Qty | Budget line | Source |
|---|---|---|---|---|---|---|
| FY2027 | RDT&E | $1.29B | — | — | — | Program Acquisition Cost by Weapon System: Fiscal Year 2027 Budget Request Office of the Under Secretary of War (Comptroller) · Apr 21, 2026 |
| FY2026 | RDT&E | $1.34B | $886M | — | — | Program Acquisition Cost by Weapon System: Fiscal Year 2027 Budget Request Office of the Under Secretary of War (Comptroller) · Apr 21, 2026 |
| FY2025 | RDT&E | — | $984M | — | — | Program Acquisition Cost by Weapon System: Fiscal Year 2026 Budget Request Office of the Under Secretary of War (Comptroller) |
The award covers several ship and shore variants and multiple kinds of engineering work. It cannot be divided into a comparable shipset price, or classified entirely as R&D.
CBO models a new architecture with different equipment and a complete site budget. The European site count comes from Navy reporting and is kept separate from this hypothetical cost scenario.
Ceilings, options and purchase agreements are not spending and are never added together. Obligations are under Contracts.
| Buyer → seller | Status | Value | Qty | Source |
|---|---|---|---|---|
| Missile Defense Agency → Lockheed MartinAegis BMD combat-system engineering agent: design, development, integration, sustainment and software across ships and shore variants. Maximum ordering capacity, not a system unit price. | Ten-year IDIQ ceiling | $2.968B | — | Contracts for July 1, 2025: Aegis BMD engineering agent U.S. Department of Defense · figure Jul 1, 2025 |
| Country | Variant | Qty | Status | Source |
|---|---|---|---|---|
| RomaniaHosts a U.S. Aegis Ashore site; not recorded as a foreign purchase of the system. | Aegis Ashore | 1 | Host nation · U.S. system | Aegis Ashore Poland completes first maintenance availability U.S. Navy / NAVSEA · 2024 |
| PolandHosts a U.S. Aegis Ashore site; not recorded as a foreign purchase of the system. | Aegis Ashore | 1 | Host nation · U.S. system | Aegis Ashore Poland completes first maintenance availability U.S. Navy / NAVSEA · 2024 |
Open research: Current U.S. inventory and complete annual operating-and-support costs require additional public evidence. Buyer records are selected examples, not a complete global order book.
What the government budgets and pays for this program, from budget justification books, appropriations, acquisition reports and contract announcements. Each figure states its dollar basis. What contractors were obligated is under Contracts.
Obligations are signed USAspending prime-contract actions coded to this program, FY2008 to date, credited to the company that received each action. Obligations are money committed, not company revenue.

Multifunction phased-array radar used by Aegis-equipped warships.
Photo: Photo by RoyKabanlit via Wikimedia Commons · CC BY-SA 4.0

Modular vertical missile launching system for surface warships.
Photo: U.S. Navy photo by Photographer's Mate 1st Class Michael W. Pendergrass · Public domain (PD-USGov-Military-Navy)
Major components and the companies that make them.