Yes.
Military Civilians can be prosecuted under the UCMJ (Uniformed Code of Military Justice) and US Federal and State Criminal Codes.
Possibly, but probably not. American contractors were employed by the Federal Government, which put them under the same protection as our military; they would be prosecuted in the US, and under US law (see the April 2015 conclusions of the Blackwater-Iraq trials). Regarding the other part of your question; 'contractor' is not a status; a person is either military or a civilian; but regardless, if they are employed on behalf, or by the government, they are subject to American law.
No there are military contractors and DOD civilians
DoD military, civilians, and contractors
Service members and their dependents, DOD/GSA civilians, DOD/GSA contractors.
http://www.rememberthefallen.org/ This list is composed of military personnel and DoD civilians, and does not include civilian contractors.
The PR focal group that refers to soldiers dodging civilians or DoD contractors is typically known as the "military operations" or "combat" focal group. This group focuses on the interactions and relationships between military personnel and various civilian entities, including local populations and private contractors. Effective communication and public relations strategies are crucial in these situations to ensure safety and maintain trust.
Civilians
Those with convictions for trafficing, distribution, possession, and/or use are barred from enlistment in the US Military.
No, Department of Defense (DOD) contractors do not fall under the Uniform Code of Military Justice (UCMJ). The UCMJ applies specifically to military personnel and certain civilians in specific circumstances, such as those accompanying the armed forces in the field. However, contractors may be subject to federal, state, and local laws, as well as the terms of their contracts with the DOD.
Only if they're civilians working for that military force.
American civil war
executives do not lead the military... civilians do. and civilians lead the military to prevent military coups. currently POTUS is Barrack Obama and SECDEF is Leon Panetta