Tested Mettle is garbage, tho you might as well read it.
Starship Troopers is a great book, get your hands on it as soon as you can.
Somalia On $5 a Day discusses, in detail, American company and battalion level operations in the early phases of Somalia, as well as training and disaster relief Stateside. Lots of "Lessons Learned".
There‘s a wealth of British books out there... CQB is good, as are Black Water and First Into Action.
Blackhawk Down is a good account of a very modern incident, and a good book with lots of detail.
I‘ve heard good thinsg about some of Farley Mowat‘s books, and "Ortona" is good but very detailed and maybe not as grunt-oriented as you‘d like.
There‘s a couple books out by German soldiers in WW2, all excellent reads. I think one is called "Soldat".
there‘s two really good books that I cnat think of right now, and got rid of awhile ago. One is the diary/recollections of an American draftee in WW2 who fights in NW Europe and ends up a Platoon Sergeant by the end. Very detailed, very honest.
Another is about a USMC officer in Vietnam who takes comman dof a Force Recon unit and details - soldiers will recognize eveything he describes, from battle procedure to rehearsals to map recce‘s to patrol procedure. Wish I could remember it‘s name...