Wexler tells Harvey not to call him Pappy any longer, call him Colonel Wexler. Wexler left the Air Corps as a Lieutenant Col, and then came back as a Colonel of a Training Command when the war started. He was partners with Bernie Hale in a flying circus for 4 years.
Harvey has known Pappy for 15 years.
This is the first time he is listed by anything other than "Gallagher's co-pilot". Gallagher recommends Banazak, Clark, Murphy and Engel as best pilots for the mission.
He is played by Robert Dornan and listed in the Credits for the first time as Lieutenant Fowler.
Gallagher first calls his co-pilot Bob, then Lieutenant Fowler, the Captain Fowler, so we can assume his name is Bob Fowler.