The Army is the senior service. It is traditionally known as the branch that fights on land. Most of America's thousands of living veterans have served in the Army, the largest of the services in total recruits. Meanwhile, the Navy, more than any of the other services, has a special way of life. Guided by traditions of the sea, it is in many ways more of a closed society than its sister services. Its officers and enlisted people work and live together at sea for long periods. Life at sea demands close attention to duties and teamwork. Ships and aircraft units have been visiting to many parts of the world to maintain strategic defenses. For most of the navy, their military job is strange but an exciting type of military career.
On the other hand, the Air Force has a different military opportunities. This is the newest of all the services which involve a highly technical military job- like maintaining and flying military fighter planes. Usually, individuals with a strong interest in aviation and mechanical trades would opt to consider training in the Air Force. Meanwhile, the Marine Corps, known as the ''first to fight'', operates both in the land and sea. It is closely associated with the Navy, and like the Navy, it prides itself on meeting the highest possible standards in training, military bearing and discipline. While, the Coast Guard is a relatively small service and, as such, offers unique military opportunities. It is oriented largely toward the enforcement of military law. In addition, it is involved with activities like searching and rescuing those in distress at sea and engaged in maritime law enforcement. Although opportunities exist for overseas assignments, many duties in the Coast Guard are related to the waters and shores of the United States. Unlike the other military branches, the Coast Guard is a service of the Department of Transportation except when operating as part of the navy in time of war or when the president so directs.
Furthermore, as to the services in military employment, these soldiers may apply for retirement after twenty years of service. At about age forty, a person is still in the prime of life for most work, and although the retirement pay is comparatively good, military retirees generally want to start new careers in civilian life and settle in one place. Thus retired service people often start new careers. The military training usually has prepared a person related trade or profession, and many military people look forward to the early retirement to engage in a retired military jobs. They view it as an excellent opportunity to take a civilian job and keep the financial cushion of military retirement pay. Others, of course, prefer to stay in the service longer or for their entire working lives. Generally speaking, only the more senior service members have that opportunity. Even in retirement, it should be noted, service people are subject to recall in times of national emergency.
It can be noted that a person can enter military career at various ages and levels in education. Many recruits enter the military employment immediately after graduating high school. Educational opportunities, for those who wish them, are available after entering the service. The range of educational opportunities is diverse. A young person can be trained to operate the engineering equipment of an aircraft carrier or, with appropriate academic qualifications, proceed through medical training to become a military physician. A broad general difference between the requirements for enlisted personnel and officers is academic preparation. There is no rigid rule, but generally officers have college degrees, whereas enlisted people do not. Frequently, however, service members in both categories obtain degrees on their own initiative and with financial help while in the service.
On the other hand, leaders in the top enlisted personnel and officers in the us military job-must have special schooling. The trainings are both involved with a highly technical mastery on certain skills, as well as on administrative leadership in handling a larger organization. These top rank personnel and officials are expected to be the main control of command for the whole military organization. Their decisions are vital to the whole operation especially during wartime- as they are directly coordinating with the highest civilian-military officer of the land, the President himself- as the Commander in Chief. Indeed, the existence of military is a fundamental force for the national security.