This led to the introduction of Swimmer Delivery Vehicles (SDVs), powered ... missile chambers used to accommodate US Navy SEAL special operations frogmen and their SDVs. After the Grayback ...

But when he joined the military, Larkin seemed to relish being a "frogman" – Navy slang for a SEAL. "I never saw him in a bad mood," said Rep. Derrick Van Orden, a senior chief in the SEALs who ...