[bpodgursky]

Imo forever war is amazing, but stranger in a strange land devolves into bizarre fantasy. I'd strongly recommend the former if you're more interested in hard sci fi and the implications of real accurate (ish) relativistic travel.

[angersock]

Seconding this... Forever War is probably some of the most readable, non-America-Fuck-Yeah military sci-fi I've read--another good one is Armor.

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.