War is about killing people and breaking the opposing sides ability to execute that war without prejudice.
It is not about the glory, though there is glory to be had. It is about the men to your left and right. It is about making the right decisions to ensure they get home.
If I could go back to 1939, I would. I am too broken down now to be effective as a platoon Sergeant in that era so I would have to volunteer my services else where. Truth be told if anyone from now were to go back in time they would be instantaneously classified At levels above Top Secret. Imagine the amount of information a single person, who has a fascination with World War II, could provide to either side. Enigma, Wind Talkers, the breaking of Japanese code, Manhattan, D-Day, Patton's fake Army, the Battle of the Bulge, radios, computers, microwaves, all of it. What we now know as common knowledge would be incredible to them.