Scifi writers should know that an army marches on their stomach. Also amateurs talk about tactics while experts talk about logistics.

You gotta feed your armies and starfleets fuel, ammo, rations for the military humans or everything comes to a screeching halt.

But I had no idea the number of *different types* of naval logistic ships.

https://en.wikipedia.org/wiki/Military_Sealift_Command#Fleet_Oiler_Program_N031