Originally posted by: Zugzwang152
whats the difference between a brigade, and a regiment, since both are constituted from battalions?
Under the "modern" U.S. Army concept of organization, here is how I remember it evolve back to the regimental system and why: During the mid-1980s, the Army sought regimental affiliations for soldiers in order to encourage espirit de corp or sense of belonging. Regimental affiliation came back into existance around 1985. One could affiliate with a certain regiment and have a "decent" chance of remaining with the regiment at OCONUS (overseas) and CONUS (US) locations. This concept worked with a few divisions such as the 82nd, 101st, 1st CAV, 1AD, 2AD and 3AD. Under present conditions, with units activating, deactivating and redesignating almost at will, this concept hasn't really worked out as it should.
Regiments have a rich history with their own individual unit crest and motto. For example, as a member of the 1/501 IN, I'd render a salution to an officer and state (supposed to "proudly state) "Geronimo, Sir". Within 502nd, it was "First Strike, Sir". If one attends a dining in or dining out when the regimental roles are read, every soldier with an affiliation responds with their respective regimental motto. Much tradition goes along with this.
Back during the "big one" or WWII, regiments often remained together. Under many circumstances during the mobilization for deployment and ultimate conflict, the regiments grew from battalions and became too big, too quick. Therefore, they were designated as regiments. Some regiments date back to the Revolutionary War. Others, particular Airborne regiments, date back to WWII. If I recall correctly the 327th was a glider regiment and therefore had the "3" numeral while the true parachute regiments, 501st, 502nd, 503rd, 504th, 505th, 506th, 507th, 508th and 509th have the "5" numeral. The 509th BCT was the former designation for the ABN battalion in Vicenza, Italy. I believe that was changed to 505th. So many of them changed from the 80s to the 90s, I couldn't keep up. I saw a couple units in Germany reflagged twice in 3 years during the mid-90s.
A very dry, official and current read on the subject:
The U.S. Army Regimental System Table