US Navy SEALs (UDT)-Underwater Demolition Teams
In the beginning there was UDT's.
During WWII there was a need for a few daring sailors to leave the relative safety of their steel ships, and enter the water to wage a dangerous, more personal war on the enemy.
From mining enemy ships, to clearing mines from our own, the UDT frogmen preformed their dangerous tasks with little more than a pair of tan trunks and a set of rubber fins.
UDT members helped gather soil samples from the beaches of Normandy weeks before the Allied invasion, to give the intelligence community much needed information about the difficulties of landing troops on the beach.
During the manned space efforts of the late 60's and early 70's, UDT frogmen were the first to greet the newly arrived astronauts, after the space capsules plunged back to Earth.