
Hammer's Slammers is a 1979 collection of military science fiction short stories by author David Drake. It follows the career of a future mercenary tank regiment called Hammer's Slammers after their leader, Colonel Alois Hammer. This collection, and other novels and stories in the same setting, are collectively called the Hammer stories, and the setting is called the Slammers universe or the Hammerverse.
Drake served in armored cavalry in Vietnam -- many of his science-fiction books imagine a universe of higher technology that is no less human.
Nominally it looks at subjects like long life, implanted AIs, etc., but it doesn't really do anything with them other than go "squeeeee look at the tooyyyyyys".
EDIT:
If you want to just bask in the sheer glory of superior firepower and gallows humor, and maybe even occasionally see something with a little bit more to say about politics and men who fight, I'd suggest the Hammer's Slammers series by David Drake. Future tank company modeled loosely off of the Foreign Legion just after WW2, the most mercenary of mercenaries, probably the coolest and most reasonable command-and-control for ground forces I've ever seen in a scifi book not set in the near future, and so forth.
I'd also recommend his Redliners, which deals in large part with the need to re-establish empathy between soldiers and the civilians they fight for. Some elements of the plot get a bit silly, but Drake was exorcising some serious personal ghosts in that one, and his conviction really shines through.
If you want more military sci-fi, check out the Hammer's Slammers series by David Drake (tank company in spaaaaaace, but not the stupid Bolo stuff); he also had one anthology that was very nearly solid cyberpunk surveillance dystopia, Lacy and His Friends.