Ethan Allen class submarine
USS Ethan Allen
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| Class overview | |
|---|---|
| Name: | Ethan Allen class |
| Builders: | |
| Operators: |
 United States Navy
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| Preceded by: | George Washington class |
| Succeeded by: | Lafayette class |
| Built: | 1959–1963 |
| In commission: | 1961–1992 |
| Completed: | 5 |
| Retired: | 5 |
| General characteristics | |
| Type: | Ballistic Missile Submarine |
| Displacement: |
Surfaced: 6,946 long tons (7,057 t) Submerged: 7,884 long tons (8,011 t) |
| Length: | 410 feet 4 inches (125.1 m) |
| Beam: | 33.1 feet (10.1 m) |
| Draft: | 29 feet 10 inches (9.1 m) |
| Propulsion: |
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| Speed: |
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| Test depth: | 1,300 feet (400 m) |
| Complement: | 12 Officers and 128 Enlisted (two crews, "Blue" and "Gold") |
| Armament: | 16 Polaris A2/A3 missiles, 4 × 21 inch (533 mm) torpedo tubes, 12 torpedoes |
Surfaced: 6,946 long tons (7,057 t)
The Ethan Allen class of fleet ballistic missile submarine was an evolutionary development from the George Washington class. The Ethan Allen, together with the George Washington, Lafayette, James Madison, and Benjamin Franklin classes comprised the "41 for Freedom" that were the Navy's main contribution to the nuclear deterrent force through the late 1980s.
Rather than being designed as Skipjack-class attack submarines with a missile compartment added, the Ethan Allens were the first submarines designed "from the keel up" as Fleet Ballistic Missile (FBM) submarines carrying the Polaris A-2 missile. They were functionally similar to the George Washingtons, but longer and more streamlined and with torpedo tubes reduced to four. In the early and mid-1970s, they were upgraded to Polaris A3s. Because their missile tubes could not be modified to carry the larger diameter Poseidon missile, they were not further upgraded.
To comply with SALT II treaty limitations as the Ohio-class ballistic missile submarines entered service, in the early 1980s the Ethan Allens were refitted as SSNs (attack submarines) nicknamed "slow attacks". Their missile fire control systems were removed and the missile tubes were filled with concrete. Sam Houston and John Marshall were further converted to carry SEALs or other Special Operations Forces, accommodating 67 troops each with dry deck shelters to accommodate SEAL Delivery Vehicles or other equipment. The Ethan Allen-class submarines were decommissioned between 1983 and 1992. All were disposed of through the nuclear Ship-Submarine Recycling Program 1992-1999.
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