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Untrained
The US Army has operated on US soil since 1776. The national guard is the US Army. To further answer your question, What would happen is the US was ever invaded? The US Army would engage the enemy.
us army will destory the spetznaz they can be a special forces us still will kill
Highly unlikely.
Please let us know what Army of Tennessee you are referring to: Confederate or Union and the relevant period of the war you need to get informed about.
expensive
Well for a start it would help if you told us in WHICH army.
can a no legal status join the US army???
Military headquarters would describe the city of Washington DC during the US Civil War.
Crippled
an oligopoly
The US Army, like the US Department of Defense, is supported by the tax payer. The US Army Corp of Engineers is part of the US Army; just like the US Army Artillery, or US Army Armor, or US Army Infantry.