After reading this book called Dead Center, about a marine sniper in Vietnam, I came up with an idea.
He was kinda nuts cause he liked what he was doing and reupped 6 monthes every chance he got.
But the mission could center on his expeirences. Like he went through boot camp and then police action in Santo Domingo where he did stupid stuff like charging mgs.
Then go to Nam where you go through sniper school and start with grunt ops. He then joined force recon and did stuff with them. Later he got weird jobs like helping ARVN at a forward base where he got a 1400m+ shot with a
Winchester 30-06. Then he went on and lobbied for and got sniper patrols called the Rogues. They mainly went out to the Co Bi Than Tan valley to ice "gooks" and disable booby traps cause grunts were dying a lot.
Then on and on this goes. If you've read the book I think it would be an interesting campaign.
Phew!