I picked up a set of paperbacks for the C.A.D.S. series by John Sievert and though they're a bit dated they're a pretty good read.

Bobiverse series while not strictly military has some decent battles.

The Space Legacy series is shaping up to a decent war for survival.

Dimension Space is kind of Sliders like with a war for survival thing too.

The first few books of the Expeditionary Force series are good. But then it just dribbles into a repetitive rehash of the same stuff over and over (and over) again without really advancing the story.

I picked up a set of paperbacks for the C.A.D.S. series by John Sievert and though they're a bit dated they're a pretty good read.

Bobiverse series while not strictly military has some decent battles.

The Space Legacy series is shaping up to a decent war for survival.

Dimension Space is kind of Sliders like with a war for survival thing too.