Military History magazine is the cream of this type of magazine. The magazine is nicely laid out, easy to read, well-written and it covers a wide variety of subjects. There is no particular slant... other than articles written to keep the reader turning the pages.
Over the roughly dozen issues I have seen, there were articles on battles ranging from the American Civil War, both World Wars, Vietnam, various Middle East conflicts, sea/submarine stories, British battles... a great variety. All are thoroughly researched and ring true to my fairly good knowledge of history.
Recommended for at least high school age and from there any...