Mercenaries fight for the highest bidder and hold no allegiance to anyone; they are private businessmen. An all volunteer army is sworn under oath to defend it's nation, and is a "profession", just like the medical field, engineering field, legal field, manufacturing field, sales, etc. The Soldiers and Sailors (and Airmen & Marines) are employed in the "profession of arms"; the field of military science.
militia is a group of all able-bodied males considered by law eligible for military service.
India
The war in Iraq is very similar to the Vietnam War, and the US is very good at fighting wars and terrible at establishish peace.
These would all be under the U.S Army.
All branches of the US Army except the Marines. This included the Army, Navy and the Army Air Corps(which was part of the army before the Air Force was a separate branch).
We currently have an all volunteer military force and have had one for more than 35 years.
The US Army, like the other US Military branches are an all volunteer fighting force, which means you have to volunteer to enlist. With your consent, being able to pass the ASVAB and physical you can then be enlisted into the Army.
It has always been an all volunteer military with the only notable exceptions were drafts.
militia is a group of all able-bodied males considered by law eligible for military service.
From a conscripted military to an all volunteer military.
India
Basically for reinforcement and special skills. Although the Romans could levy plenty of troops from Italy, some of their allies had specialities that were useful such as slingers, bowmen and cavalry which could reinforce the Roman units. An example of this is their Batavian allies who were not only excellent horsemen, but they prided themselves on being able to swim across a river in full armor.
From WWII until the end of the Vietnam War, women were part of the US Army's WAC (Women's Army Corps); US Navy WAVE's (Women Allowed Volunteer Emergency service); etc. After Vietnam came the all volunteer military and the WACs and WAVEs were abolished in about 1975. Today-the US military has transitioned into a military/law enforcement force (effective 1990s) and is a equal opportunity employer.
No, the US currently has an all-volunteer military.
1. The all volunteer Army! 2. The all volunteer Air Force! (they never drafted much anyway). 3. The all volunteer Navy! 4. The all volunteer Marine Corps!
Yes and no. The Americans wanted to help Nationalist China against the Japanese aggression, but they still wanted to remain neutral rather than being dragged into what would eventually become WW2. So they created a group known as the "Flying Tigers" which were volunteer US Air Force pilots, and made them independent of the US government by claiming they were mercenaries.Technically they could be considered mercenaries by some definitions, but in practice they were basically a military unit. They were all drafted straight from the military, had limited military equipment, military training.
All volunteer military.