While elite units were in existence during the Second World War, the US Army Special Forces was not.
Certainly. It should be noted the Battle of the Bulge and to a lesser extent Normandie- pitted the US against the elite of the German Army, Waffen-SS troops and Luftwaffe.
Within the U.S armed forces the most elite forces are comprised of Delta forse, Navy Seals, Green Berets, Marine force recon and Army Rangers. Bridging the line between traditional forces and elite units are Airborne units such as the 82nd Airborne Division, and the Marines. The order of battle is then determined by the location of the mission area and threat as the determining factor to which forces will be used.
The british forces :P
WWII created the US Army's airborne units.
The US Army has intelligence units and intelligence sections within each headquarters units who are responsible for gather information on enemy units, strengths, and movements. Spying, per se, is the venue of the CIA.
There may be users on this site who have experience as a US Army medic, but their presence cannot be guaranteed. It is best to ask specific questions related to being a US Army medic and wait for someone with relevant experience to respond.
Yes, the National Guard is a deployable force, just like any other military branch. The US Army National Guard is the entire reserve force of Combat Arms units for the US Army (save for one infantry battalion assigned to the US Army Reserve), and these units have been called up regularly since 2001 for deployments around the world.
Douglas MacArthur
Customary Units
The United States Army of the Plains during the 1800s were called the US Cavalry. They were also called bluecoats or yellowlegs.
North Vietnamese Air Force vs US Air Force and US Navy air units. North Vietnamese Army vs US Army, US Marines, ARVN, Australian Army, ROKs, etc.