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São Jorge-class minesweeper
Photo: U.S. Navy Bureau of Ships · Wikimedia Commons · Public domain Use of this image does not imply endorsement by the U.S. Department of Defense (DoD).
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SãoJorge-classminesweeper

Mine Countermeasures Vessels (MCM) · United States · 1955
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SãoJorge-classminesweeper

São Jorge-class minesweeper
São Jorge-class minesweeper Photo: U.S. Navy Bureau of Ships · Wikimedia Commons · Public domain Use of this image does not imply endorsement by the U.S. Department of Defense (DoD).
MASS (Military Archive Scoring System) 40
* Absolute score — assessed within category · no era adjustment
Mine-Hunting Effectiveness
40
Sonar & Sensors
35
Low Signature
50
Clearance Rate
45
UUV Integration
0
Endurance
55
Reliability
60
Survivability
40
Technology
30
Cost-Effectiveness
70
Methodology ↗ → Mine Countermeasures Vessels (MCM) ranking
Origin United States
CategoryMine Countermeasures Vessels (MCM)
EraEarly Cold War
In service1955
Operators1 countries
⬇ Overview
⚙ Specs
⊕ History
⊕ Operators
⚖ MASS Score
📚 Sources
Data Quality84%
MASS(Military Archive Scoring System)
⊟ Mine Countermeasures Vessels (MCM)ranking ↗methodology ↗
40
Mine Countermeasures Vessels (MCM) MASS Rating
22/38
Early Cold War
91/173
All-Time
Mine Countermeasures Vessels (MCM) · 10 axes scored
Mine-Hunting Effectiveness
40
Sonar & Sensors
35
Low Signature
50
Clearance Rate
45
UUV Integration
0
Endurance
55
Reliability
60
Survivability
40
Technology
30
Cost-Effectiveness
70
ⓘ Regardless of era, the same scoring system applies to all units in the mine countermeasures vessels (mcm) category.
01 / Overview
São Jorge-class minesweeper
Category
Mine Countermeasures Vessels (MCM)
Country
United States
Production
1955–
Operators
1 countries
💰 PERFORMANCE / PRICE ASSESSMENT Methodology ↗
MINE COUNTERMEASURES VESSELS (MCM) · EARLY COLD WAR
22
PERFORMANCE/PRICE
78
UNIT COST (2025 USD)
—
MASS SCORE ↗
40
mine countermeasures vessels (mcm) category
ⓘ Performance/Price and MASS score are computed across all units in the mine countermeasures vessels (mcm) category, regardless of era.
02 / Specs & Design
◎Identification2MOD.2
  • Ship TypeMine Countermeasures Vessel (MCM)
  • Rolelocating and removing naval mines
03 / History
SERVICE LIFESPANStill in Service
  1. 1955Production started
71
years in service
1
countries operating
04 / Operators
Operator Countries1country
PortugalACTIVE
Mine Countermeasures Vessels (MCM) Early Cold War United States
📚 Sources
📖 ENCYCLOPEDIA Browse the Mine Countermeasures Vessels (MCM) entry →