The duties and responsibilities of people serving in the military can vary widely depending on their roles. As with any huge employer, some men and women will be responsible for filing and report-keeping, and others will be responsible for training new recruits. However, there are some responsibilities that all military personnel have to fulfill.
One of the primary duties of anyone in military service is to come when called upon. This is true of the weekend warriors in the National Guard as well as regular enlisted personnel. Whether it's Army troops being deployed overseas, U.S. Marines performing training operations in Arizona or the federal government activating National Guard units in a natural disaster in a major city, it doesn't matter--when the country puts out the call to duty, it's the duty of those in the armed forces to respond.
A part of every serviceman's oath is to protect the United States against all enemies, both domestic and foreign. Of course, it's the United States that defines who the enemy is and therefore who servicemen will be fighting. It is therefore the duty of those in the military to fight the designated enemies of the United States and to attempt to defeat them as completely as the military's mission states. This is true even if the service personnel disagree that these people are really an enemy of the United States. They have to follow orders.
Duties of Rank
A person's military rank usually defines his responsibilities and duties. For instance, an Army private's only real duty is to follow orders and to accomplish what he's told to. A sergeant in the Army will have to not only follow orders from above, but organize and coordinate people under her command to achieve those goals. The higher up the chain of command you go, the more important your responsibilities become, until you are in charge of massive troop movements and you find yourself faced with the conflicting responsibilities of achieving military goals and keeping all of the soldiers under your command safe.
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