Aircraft / Aviation Vehicles & Artillery Infantry Arms Warships & Submarines Military Pay Chart (2023) Military Ranks
Naval Warfare

USS Greenling (SSN-614)

Nuclear-Powered Fast-Attack Submarine [ 1967 ]

USS Greenling SSN-614 was commissioned in 1967 and led a service life that ran into 1994.

Authored By: Staff Writer | Last Edited: 05/02/2019 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

Throughout the 1960s, the United States Navy (USN) committed to building a new fleet of nuclear-powered fast attack submarines through the "Thresher-class". Fourteen boats were completed and the series was characterized by their angled torpedo tubes (at midships) as well as a spherical bow containing the sonar fit (BQQ-2/BQQ-5 low-frequency sonar sphere). When lead-ship USS Thresher (SSN-593) was lost with all hands aboard (129) during deep diving tests off the coast of Cape Cod on April 10th, 1963, the group was renamed to "Permit-class" (after the second ship-of-the-class). USS Greenling was one of three boats chosen for the "Improved Thresher-class" upgrade (joining USS Flasher and USS Gato).

The Permit-class succeeded the outgoing Skipjack-class and was itself followed by the Sturgeon-class boats.

The contract to build USS Greenling (SSN-614) was awarded to General Dynamics Electric Boat of Groton, Connecticut on June 9th, 1960. Her keel was laid down on August 15th, 1961 and the boat was put to sea on April 4th, 1964. Formal commissioning took place on November 3rd, 1967 and the vessel was given the fighting motto of "Steel True and Blade Straight".

The boat's design was consistent with the class's standard: the sail was positioned towards the bow, which itself was rounded to cut through the water. The sail contained the usual scopes, sensors, and communications masts as well as the dive planes. The hull tapered towards the stern and featured a cruciform tailplane arrangement for control.

Dimensions of the boat included a length of 292.2 feet, a beam of 31.7 feet, and a draught of 24 feet. Displacement reached 3,800 tons. The aforementioned "Improved Thresher-class" program added nearly 14 feet to her length which, in turn, allowed for more internal volume to be had. As such, work and living spaces were able to be enlarged accordingly.©MilitaryFactory.com
Aboard was a crew numbering 114 officers and enlisted. The armament suite involved 4 x 21" (533mm) torpedo tubes and these tubes resided near midships, angled outwards to clear the hull when fired. twelve to eighteen reloads of the Mk 37 torpedo family were initially carried. Later support arrived for the UUM-44 SUBROC anti-submarine missile and UGN-84 anti-ship missile.

Power came from a single S5W (S = Submarine; 5 = 5th Generation; W = Westinghouse) Pressurized Water Reactor (PWR). This same powerplant fueled the Skipjack-class up until the Los Angeles-class boats introduced the 6th Generation S6G series during the 1970s. USS Greenling could reach speeds of 30+ knots, making her an ideal candidate for fast hit-and-run attacks against Soviet shipping and unsuspecting warships. Due to the nature of nuclear energy, the vessel was given essentially unlimited range and excellent performance under water.

Commissioned in November of 1967, USS Greenling made her home out of New London, Connecticut, giving her clear access to the Atlantic Ocean. She was assigned to SUBRON 10 (SUBmarine squadRON #10) for a bulk of her service life. Her one notable action arrived in May of 1968 in response to the loss of USS Scorpion (SSN-589) - which had mysteriously gone silent. USS Scorpion, a Skipjack-class boat commissioned in July of 1960, went down in the Atlantic Ocean on may 22nd, 1968 with her crew of 99 men. No cause was ever found for the loss of the boat which was eventually located 400 nautical miles SW of the Azores. Greenling did what it could but all was eventually labeled a loss.

Greenling continued in USN service until April 18th, 1994 when she was officially decommissioned from service. Her name was struck that same year and she quickly entered the Ship-Submarine Recycling Program to properly dispose of her reactor set. Only some components of her control room were spared the scrapman's torch and these put on display at the Naval Undersea Museum of Keyport, Washington.

The Thresher-/Permit-class continued in active service, as a whole, up until 1996 when the last boat (USS Gato (SSN-615)) was decommissioned (April 25th, 1996). The Sturgeon-class succeeded the fleet and 37 of the design were built for the USN. These, operating until 2004, were supplanted by the Los Angeles-class.©MilitaryFactory.com
Note: The above text is EXCLUSIVE to the site www.MilitaryFactory.com. It is the product of many hours of research and work made possible with the help of contributors, veterans, insiders, and topic specialists. If you happen upon this text anywhere else on the internet or in print, please let us know at MilitaryFactory AT gmail DOT com so that we may take appropriate action against the offender / offending site and continue to protect this original work.


Service Year

United States national flag graphic
United States

Destroyed, Scrapped.


USS Thresher (SSN-593); USS Permit (SSN-594); USS Plunger (SSN-595); USS Barb (SSN-596); USS Pollack (SSN-603); USS Haddo (SSN-604); USS Jack (SSN-605); USS Tinosa (SSN-606); USS Dace (SSN-607); USS Guardfish (SSN-612); USS Flasher (SSN-613); USS Greenling (SSN-614); USS Gato (SSN-615); USS Haddock (SSN-621)

National flag of the United States United States
(OPERATORS list includes past, present, and future operators when applicable)
Submerged Attack
Traveling under the surface to search, track, and / or engage or reconnoiter areas.
Maritime Patrol
Active patroling of vital waterways and maritime areas; can also serve as local deterrence against airborne and seaborne threats.
Fleet Support
Serving in support (either firepower or material) of the main surface fleet in Blue Water environments.

292.2 ft
89.06 m
31.7 ft
9.66 m
24.0 ft
7.32 m

Installed Power: 1 x S5W Pressurized Water Reactor (PWR) nuclear reactor driving 1 x shaft.
Surface Speed
25.0 kts
(28.8 mph)
Submerged Speed
30.0 kts
(34.5 mph)
Essentially Unlimited

kts = knots | mph = miles-per-hour | nm = nautical miles | mi = miles | km = kilometers

1 kts = 1.15 mph | 1 nm = 1.15 mi | 1 nm = 1.85 km
4 x 21" (533mm) torpedoes

Supported Types

Graphical image of an aircraft aerial torpedo

(Not all weapon types may be represented in the showcase above)

Military lapel ribbon for the Cold War period
Military lapel ribbon for early warship designs
Military lapel ribbon for the Falklands War
Military lapel ribbon for the 1991 Gulf War
Military lapel ribbon for the Korean War
Military lapel ribbon representing modern aircraft
Military lapel ribbon for the Attack on Pearl Harbor
Military lapel ribbon for the Russian Invasion of Ukraine
Military lapel ribbon for the Vietnam War
Military lapel ribbon for the World War 1
Military lapel ribbon for the World War 2

Ribbon graphics not necessarily indicative of actual historical campaign ribbons. Ribbons are clickable to their respective naval campaigns / operations / periods.

Images Gallery

1 / 1
Image of the USS Greenling (SSN-614)
Image from the Public Domain.


Disclaimer | Privacy Policy | Cookies

2023 Military Pay Chart Military Ranks DoD Dictionary Conversion Calculators Military Alphabet Code Military Map Symbols

The "Military Factory" name and MilitaryFactory.com logo are registered ® U.S. trademarks protected by all applicable domestic and international intellectual property laws. All written content, illustrations, and photography are unique to this website (unless where indicated) and not for reuse/reproduction in any form. Material presented throughout this website is for historical and entertainment value only and should not to be construed as usable for hardware restoration, maintenance, or general operation. We do not sell any of the items showcased on this site. Please direct all other inquiries to militaryfactory AT gmail.com. No A.I. was used in the generation of this content; site is 100% curated by humans.

Part of a network of sites that includes GlobalFirepower, a data-driven property used in ranking the top military powers of the world, WDMMA.org (World Directory of Modern Military Aircraft), WDMMW.org (World Directory of Modern Military Warships), SR71blackbird.org, detailing the history of the world's most iconic spyplane, and MilitaryRibbons.info, cataloguing military medals and ribbons.

View day-by-day actions of the American Civil War with CivilWarTimeline.net. View day-by-day actions of World War II with SecondWorldWarHistory.com.

©2023 www.MilitaryFactory.com • All Rights Reserved • Content ©2003-2023 (20yrs)