W.E.B. Griffin is great. His series about the Marines pretty much checks all the boxes the OP asks for...
It's called The Corps Series. His style is kind of like 'Forrest Gump,' where he picks one character, and everything happens to that character.
I also read the Badge of Honor, (Philly cops) excellent!!!
Now on Presidential Agent series, so-so — my guess it it's ghost written by his son.
Another voyaging book that I think is a must-read is 'This thing of Darkness' by Harry Thompson
. it's about the voyage of the Beagle with Fitzroy, Darwin and all. Excellent!!!