USS Barbel (SS-580) - 1950s and 1960s

1950s and 1960s

Barbel-class submarines were originally designed and built with bow planes. Around 1960, the Barbel had been operating off the coast of the Eastern U.S. while participating in training exercise SLAMEX. Following her first dive of the day to test depth (700 feet), she ruptured a 5" line used for cooling equipment which circulated sea water throughout the boat at ambient pressure. It's rumored that this was a defect in construction when a hole for a junction or valve got mistakenly taped and painted over. Thus for the first part of her career all that was holding out the sea at test depth was a piece of tape and a layer of paint. An emergency blow was performed and on reaching the surface it was found that she had taken on 350 long tons (360 t) of water in the engine room. She entered Portsmouth Naval Shipyard and underwent major repairs of all her piping over 2". At that time, her bow planes were also converted to fairwater planes.

In 1966 Barbel accidentally rammed and sank North Vietnam's largest freighter while trying to determine what type of war-related cargo it was carrying. Although damaged, Barbel was able to remain submerged and return to port for repairs. {Citation needed|date=March 2007}}

During the 1950s and 1960s, the early classes of nuclear submarines suffered propulsion plant reliability problems, and occasionally were unable to complete their assigned missions. In 1969, while deployed in WESPAC, Barbel was assigned to fill in on a "special mission" for such a nuclear submarine. It was noted by the control room watch standers at that time that there should be some sort of recognition badge, similar to the recently authorized "Polaris Patrol Pin", for diesel boats required to fill in for a broken down nuclear submarine. A contest was held to design the badge. ETR-3(SS) Leon Figurido's winning design was a broadside view of a guppy submarine with SS superimposed on the North Atlantic sail. There were two bare-breasted mermaids facing towards the sail with arms outstretched. Completing the design was a wreath under the boat, with holes for stars, and centered on the wreath were the letters "DBF" standing for "Diesel Boats Forever". And so was born the DBF pin.