I was thinking the same thing. Maybe not my favorite time travel in a book, but definitely my favorite book with time travel.

Yeah, the war story is told chronologically but he keeps jumping around to different points in his life. There a long (and cool) but about how the aliens who take him see all of time at once and live in all of it simultaneously (they are responsible for the end of the universe too). They say our point of view is like being strapped onto a train car, traveling parallel to some mountains with a metal case around our head and our very long, narrow tube coming out of it that we can see down. Our view of time is extremely limited and narrow, and only progresses in one direction.