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The American Expeditionary Force was the US Army in Europe during World War 1.
In WW2, the U.S. Army, US Army Air Corps, U.S. Navy, U.S. Coast Guard, and U.S. Merchant Marine were all instrumental in defeating Nazi Germany, while the U.S. Marines and U.S. Navy were the leading forces in defeating Japan.
Marine Force Recon
US Expeditionary Force
Army Air Force Navy Marine Corps
The 5th and 6th Marine Regiments and the 6th Machine Gun Battalion became the 4th Marine Brigade with a troop strength of 9,444 men. They were combined with the 2nd Engineer Regiment (US Army) and 3rd Brigade, US Army to form the 2nd Division (Army), American Expeditionary Force. The Second Division was under the command of two different Marine Corps Generals at different times during WWI, Brigadier General Charles A. Doyen and Major General John A. Lejeune.
The Army, Air Force, Navy, Marine Corps, and Coast Guard
The Joint Chiefs of Staff.
Yes. Staff Sergeant is pay grade E6 in both the US Army and US Marine Corps (it's pay grade E5 in the Air Force).
The US Military consisted of: US Navy US Marine Corps US Army The US Coast Guard was also a part of the defense structure. The Air Force didn't exist until after World War 2.
Col "Name" (RET) for Air Force and Marine Corps, COL "Name" (RET) for Army.
The Joints Chiefs of Staff ( JCS ).