If by galactic warfare you mean humans vs aliens, to me, there has never been a greater Sci-Fi series written then John Ringo's legacy of the Aldenata aka Posleen wars.
I think this is by far the greatest alien invasion story ever written and highly recommend the first 4 books which really sum up the story.....follow on books were written with co-authors and while not bad books just don't stack up to the first four which really told and concluded the story.
https://www.goodreads.com/series/43106-posleen-war
Seriously......if you love great Sci-fi....it doesn't get any better then this!