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UGM-27 Polaris A-2
Photo: Flickr user "John Griffiths" https://www.flickr.com/photos/indieflickr/ · Wikimedia Commons · CC BY-SA 2.0
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UGM-27PolarisA-2

SLBM · United States · 1960
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UGM-27PolarisA-2

UGM-27 Polaris A-2
UGM-27 Polaris A-2 Photo: Flickr user "John Griffiths" https://www.flickr.com/photos/indieflickr/ · Wikimedia Commons · CC BY-SA 2.0
* Absolute score — assessed within category · no era adjustment
Range
60
Payload / MIRV
50
Accuracy
45
Platform Survivability
70
BMD Penetration
30
Readiness
75
Reliability
70
Second-Strike Value
80
Strategic Impact
85
Technology
75
Origin United States
ManufacturerLockheed Corporation
CategorySLBM
EraEarly Cold War
In service1960–1971
Operators1 countries
Quantity140
Data Quality84%
MASS(Military Archive Scoring System)
65
SLBM MASS Rating
2/6
Early Cold War
17/30
All-Time
SLBM · 10 axes scored
Range
60
Payload / MIRV
50
Accuracy
45
Platform Survivability
70
BMD Penetration
30
Readiness
75
Reliability
70
Second-Strike Value
80
Strategic Impact
85
Technology
75
ⓘ Regardless of era, the same scoring system applies to all units in the slbm category.
01 / Overview
UGM-27 Polaris A-2
Category
Prime contractor
Production
1960–1971
Quantity
140
Operators
💰 PERFORMANCE / PRICE ASSESSMENT Methodology ↗
SLBM · EARLY COLD WAR
2
PERFORMANCE/PRICE
78
UNIT COST (2025 USD)
—
65
slbm category
ⓘ Performance/Price and MASS score are computed across all units in the slbm category, regardless of era.
02 / Specs & Design
◎General7MOD.7
  • Missile ClassSLBM
  • Service Entry Year1962
  • DesignerLockheed Missiles & Space Company
  • Length9.45 m
  • Diameter1.37 m
  • Launch Weight13,600 kg
  • In ServiceYes
◈Propulsion6MOD.6
▣Performance6MOD.6
◇Accuracy & Re-Entry5MOD.5
◆Warhead7MOD.7
▤Basing5MOD.5
⬢Production3MOD.3
  • Total Production140
  • Operators1
  • First Test1960
▲Warhead Detail2MOD.2
  • Detonation Mechanism / Fuzecontact/airburst
  • Explosive Filler TypePBX
03 / History
SERVICE LIFESPANStill in Service
  1. 1960Production started
  2. 1962Entered service
  3. 1971Production ended
66
years in service
11
years in production
140
units produced
1
countries operating
ⓘ The producing country still actively operates it.
04 / Operators
Operator Countries1country
📖 TERMS ON THIS PAGE7terms
Designation for an ICBM equipped with a canister launcher, enabling rapid deployment and reduced exposure during launch.
A missile launch method where the missile is ejected from its launch tube by gas pressure before the rocket motor ignites, typically used in submarine-launched ballistic missiles.
Guidance system combining inertial navigation (self-contained motion tracking) with GPS (satellite-based positioning) for precise trajectory correction in ballistic missiles.
Relating to or using nuclear energy, typically fission, for propulsion or power generation in military vessels.
Propellant consisting of a solid mixture of fuel and oxidizer, enabling long-term storage and immediate launch readiness.
Designation for intercontinental ballistic missiles (ICBMs) deployed and launched from submerged submarines.
Relating to nuclear weapons that derive destructive power from both fission and fusion reactions, typically used in intercontinental ballistic missiles.
These terms are listed automatically because they appear on this page.full encyclopedia →
📚 Sources
📖 ENCYCLOPEDIA Browse the SLBM entry →