Regiment

[zovs66]

My post (#2) was generally for WW2 combatants, plus Korea and to some extent Vietnam. But as Andy points out from around Vietnam onwards most countries have made (due to the changing nature of combat and warfare) combat units more manageable and flexible.

Sort of like using both combined arms but a lot smarter now with the changing nature of warfare (counter terrorism).

The USMC has free stuff on the Iraq War and Afghanistan War which has some very detailed and useful info on how the US and USMC in particular deploy now.