I like the Stephen Hunter novels featuring Vietnam era former sniper Bob Lee Swagger and I think I read them all.. I also liked the 07 movie "Shooter" featuring Mark Walberg but Swagger is about in his early 30's in 2007 and in Hunter's latest Swagger book, published in 2022, the guy is a 73 year old with a titanium hip and a bunch of ailments related to a long active life. "Targeted" might be the last of the Swagger novels but I liked it even with the Revolutionary War references.