Starship Troopers - R.A.Heinlein - any book like that?

Hi guys, can you please recommend any books like the Starship Troopers by Heinlein? I mean space marines + some politics / philosophy. I dont mean straightforward military like Robert Fabian (too simple) and no space opera. The only book / serie like ST I know is The War Against the Chtorr by David Gerrold - so something like that. Thanks:)