Active MCMs (as of 3 Oct 2026)
4
MCM-7,9,10,14 · all at Sasebo, Japan
Inactive / decommissioned
10
4 decommissioned in 2025 alone
Class total built
14
1987–1994 · wooden-hulled · Peterson & Marinette Marine
Planned retirement
FY2029
All 4 active MCMs planned to inactivate in FY2029 (PB27 plan, May 2026)
Commissioning timeline — all 14 ships
1987 to 1994 · Peterson Builders (Sturgeon Bay, WI) & Marinette Marine (Marinette, WI)
Active vs Inactive by hull number
4 active remaining — all forward-deployed Sasebo
Class note — wooden hulled mine countermeasures ships
Key facts about the Avenger class
Design
• Wooden hull construction (non-magnetic)• 224 ft (68 m) length · 1,312 tons full load
• 4 Isotta Fraschini diesel engines
• 14 knots max speed
• Purpose: locate, classify & neutralize mines
Retirement context
• 4 decommissioned Sep 2025 in Bahrain ceremony• MCM-3 Sentry: Sep 24 2025
• MCM-6 Devastator: Sep 25 2025
• MCM-11 Gladiator: Sep 4 2025
• MCM-13 Dextrous: Sep 3 2025
Active fleet (2025–2027)
• MCM-7 Patriot — Sasebo, Japan• MCM-9 Pioneer — Sasebo, Japan
• MCM-10 Warrior — Sasebo, Japan
• MCM-14 Chief — Sasebo, Japan
• All planned to inactivate in FY2029 (PB27 plan)
Keel-to-delivery (C→D) — all 14 Avenger-class MCMs
Months from keel laying to delivery. Colored by builder. MCM-4 Champion took 58 months keel-to-launch (construction difficulties confirmed, not an error).
MCM service life — all 14 ships
Commission to decommission. Green = active, dim = inactive. Class retiring 2013–2027.
| Hull | Name | Status | Fleet | Homeport | Award | Keel | Launched | Christened | Commissioned | Delivery | Decomm date | Decomm yr | C→D mo | Builder |
|---|