Technically there are no dive "units" in the US Army. There is however an MOS for diver, 21D. (See the link below for information regarding 21D).
Army divers have been attached to units at the following installations:
There are a number of current active duty US Army Air Cav units. You may look at the web sites of individual posts for specific units for specific contact information. Try the US Army web site at http://www.army.mil/info/organization/installations/forts/ for a start. You can look at individual posts linked on this page.
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a post can be a few things but is generaly the place where you stand a watch, the army also refers to their bases as posts
They were called legions, with six to ten thousand men, the equivalent of a division in a modern army.
Canadian Army Veteran Motorcycle Units was created in 2003.
In army units
There are several Army Posts in Texas. The term is Post for Army installations while Base is used for Air Force installations. Ft Hood, Ft Sam Houston and Ft Bliss are Army Posts in Texas. See related links for an Army Installation locator.
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The United States Army has several elite forces. The Army Special Forces are sometimes referred to as "Green Berets." There are also Army Rangers, and Airborne units. For many years, these were the only army units that wore berets.
TDA units are non-deployable and support warfighting MTOE units. TDA units are the posts/garrison, school houses etc., MTOE units are Infantry, Engineers, Quartermasters, Ordnance etc.
Army units do not deactivate or reactivate; they inactivate or activate.
You would need a specific unit or office you wished to contact before this question could be answered. Fort Jackson - like most Army posts - house several units, hosts several reserve status units, and has a number of supporting offices. There is no "one phone number to rule them all".