I believe the 8th Air Force alone lost more men (almost 24k KIA) then the entire USMC in WW2 (about 17k KIA). By the way, every time this topic comes up, there always seems to be some Marine that thinks this is somehow a slight against the USMC. Nothing could be further from the truth. It is a simple fact, and does not detract from the heroism of the USMC in any way. All services (even the USCG) pulled their weight in WW2, and all the losses were tragic, and staggering by today's standards.
Regarding the 45th Infantry Division swastika (a native Indian symbol in the US), its different from the Nazi one in that the 90 degree angles at the end of each crossbar go the opposite direction from the Nazi one. They changed it nonetheless due to the possibility of confusion. The 45th has an awesome museum open to the public in Oklahoma City that I highly recommend.
Regarding the fact that pilots that survive their first few missions tend to have much higher chance of survival overall, this is well known to the USAF. This was the whole reasoning behind the RED FLAG exercises being implemented, in order to increase a fighter pilot's chances of survival by giving him his first 10 "combat missions" or at least the closest approximations possible in an exercise. The other reason was to fix the abysmal kill ratio that was coming from USAF fighter units in Vietnam. If you look at WW2 ace pilots, they tended to survive disproportionately. Several of the top aces were killed in accidents, but relatively few in combat. Richard Bong (top US ace) was killed testing an early jet, and the German ace often mentioned as the greatest by his peers (Hans-Joachim Marseille) was killed while trying to bail out of an airplane after an engine failure. All of the top 3 overall survived the war, although #2 and #3 were shot down 17 times between them. Erich Hartmann, the number one by amount of kills (even if you subtract the disputed ones, he still comes out number one by most reckonings) with 352, was never shot down although he had to crash land 14 times, again driving home the danger involved in aviation in WW2.