It most likely was named by its first pilot, Jack Dieterle. Around his family, he sometimes referred to his plane as the "Little Grampus." "Gramper" is the Dutch variant of the word "grampus" which denotes Risso's dolphin (Grampus griseus), which is the size of a whale and sometimes confused with a killer whale. The most famous grampus was Pelorus Jack, who was famous for piloting ships through perilous straights around New Zealand. The idea seems to have been that Jack (Dieterle), piloting a whale-like plane, aspired to lead his crew to safety through perilous straights.

His mother Ruby, however, was very reluctant to tell people the name of her son's plane because she thought the obscure word had pornographic connotations.

566th BS, 389th BG, 8th AF. TDY 9th AF.

Flew on 1st Aug 43 Ploesti oil refinery raid piloted by Lt Jack W Dieterle, returning safely to Libya. "I was the only ship to get back out of my flight and on the way back I didn't think I was going to make it into my home base because of my dwindling gas supply. I thought I was going to have to make a landing in the sea but as luck would have it I set my ship down on the old home grounds with sputtering engines, crew intact, and but one machine gun bullet in my number one engine to show for my efforts in the raid."

“Aboard Sandwitch, in the fourth wave, no one fell asleep. A gunner one plane over, in The Little Gramper, saw what happened. Some crewmen from Sandwitch were waving at him when an antiaircraft shell struck the bomb bay fuel tank. In an instant, gas poured out of Sandwitch and the plane caught on fire. The pilot, Robert Horton, took the plane up to bombing altitude and dropped their bomb load squarely on the target, but Sandwitch was finished. It took several more hits. The gunner watching from The Little Gramper said, “It was a horrible sight watching the burning plane and knowing that the men in there were fighting for their lives and there was nothing we could do to help.” The Sandwitch, the element leader, eventually crashed.

Transferred to the 491st Bomb Group 15 May 44. Noted as War Weary repainted in high visibility paint scheme and became Group's first assembly ship.

Struck off Charge, scrapped, England.