A story of brotherhood and heroism in the U.S. Navy at Chosin, 1950: Thomas Hudner and Jesse Leroy Brown.
The fact that his friend hadn't got out of the plane meant one of two things. Either Jesse was too badly hurt to extricate himself, or he was somehow pinned in the wreckage. Without a second thought Lieutenant Hudner prepared to do the wrong thing, because it was the right thing to do.
I assume you'll want to read it all.
[h/t to Maggie--who has her own story about Lieutenant Hudner--for the link]