There's really no definite answer for this. The Army moves personnel around as needed, and there isn't a set pattern to it.
You can be called to active duty.
Yes, you do.
600,000
Someone who has retired from an active duty position with the army national guard can transition to a role with the air force. The soldier would have to meet the requirements for reenlisting.
Yes
600,000
The South African army has about 67,000 active duty soldiers. There is another 15,000 soldiers that are on reserve duty.
Yes, you would qualify as a veteran if you served in the Army National Guard for 6 months on active duty between 1962 and 1968.
The same as the active duty army and reserves do.
around 3000
No, the Army Reserve Component Achievement Medal cannot be worn with the Army Active Duty Good Conduct Medal. Each medal is earned for different accomplishments and periods of service, and they are not meant to be worn together.
Separation in the army usually occurs when a person reaches the their Expiration of Term of Service. This is the date they are released from active duty. Separation from the army means a person is leaving active duty but may still have military obligations.