Limited Duty Officer: due to the highly technical nature of some officer billets, the Marine Corps, Navy and Coast Guard employ a system of promoting proven senior enlisted members to the ranks of commissioned officers. They fill a need that is similar to, but distinct from that filled by warrant officers (to the point where their accession is through the same school). While warrant officers remain technical experts, LDOs take on the role of a generalist, like that of officers commissioned through more traditional sources. LDOs are limited, not by their authority, but by the types of billets they are allowed to fill. However, in recent times they have come to be used more and more like their more-traditional counterparts.
Prospective service members are often recruited from high school or college, the target age ranges being 18–35 in the Army, 18–28 in the Marine Corps, 18–34 in the Navy, 18–39 in the Air Force and 18–27 (up to age 32 if qualified for attending guaranteed "A" school) in the Coast Guard. With the permission of a parent or guardian, applicants can enlist at age 17 and participate in the Delayed Entry Program (DEP), in which the applicant is given the opportunity to participate in locally sponsored military activities, which can range from sports to competitions led by recruiters or other military liaisons (each recruiting station's DEP varies).
SOC is a consortium of more than 1550 colleges and universities that provide educational opportunities for servicemembers and their families. It is co-sponsored by the American Association of State Colleges and Universities (AASCU) and the American Association of Community Colleges (AACC) and managed for the DoD by the Defense Activity for Non-Traditional Education Support (DANTES). Course work can be done on campus, at military installations and armories, and at a distance by computer or correspondence. Associate, bachelor, and graduate-level degree programs are available. Special curriculum areas include SOCAD (Army), SOCNAV (Navy), SOCMAR (Marines), and SOCGuard (Army National Guard). In addition, SOC operates ConAP (Concurrent Admissions Program) to increase college enrollment of Army enlistees (Army and Army Reserves). ConAP allows you to enlist in the Army at the same time as you apply for college. DANTES also operates its own Distance Learning Program. For more information, contact:
The academy, now celebrating its 75th year of service to the nation, reduced the entering-class size from 350 midshipmen per year to some 270 years ago. The infrastructure is there to support larger classes (but not the budget), making this revitalization of the student body an obvious first step. An increase in class size would assure the nation of additional committed Merchant Marine officers available to man any vessels that the U.S. might need to utilize in a national emergency. As investments in national security go, this one is inexpensive.

Military history is often considered to be the history of all conflicts, not just the history of the state militaries. It differs somewhat from the history of war, with military history focusing on the people and institutions of war-making, while the history of war focuses on the evolution of war itself in the face of changing technology, governments, and geography.
As the speed of technological advances accelerated in civilian applications, so too warfare became more industralised. The newly invented machine gun and repeating rifle redefined firepower on the battlefield, and, in part, explains the high casualty rates of the American Civil War. The next breakthrough was the conversion of artillery parks from the muzzle loading guns, to the quicker loading breech loading guns with recoiling barrel that allowed quicker aimed fire and use of a shield. The widespread introduction of low smoke (smokeless) propellant powders since the 1880s also allowed for a great improvement of artillery ranges.
Personnel may be recruited or conscripted, depending on the system chosen by the state. Most military personnel are males; the minority proportion of female personnel varyies internationally (approximately 3% in India,[8] 10% in the UK,[9] 13% in Sweden,[10] 16% in the US,[11] and 27% in South Africa[12]). While two-thirds of states now recruit or conscript only adults, as of 2017 50 states still relied partly on children under the age of 18 (usually aged 16 or 17) to staff their armed forces.[13]
The projected active duty end strength in the armed forces for fiscal year 2017 was 1,281,900 servicemembers,[4] with an additional 801,200 people in the seven reserve components.[4] It is an all-volunteer military, but conscription through the Selective Service System can be enacted at the President's request and Congress' approval. All males ages 18 through 25 who are living in the United States are required to register with the Selective Service for a potential future draft.

SOC is a consortium of more than 1550 colleges and universities that provide educational opportunities for servicemembers and their families. It is co-sponsored by the American Association of State Colleges and Universities (AASCU) and the American Association of Community Colleges (AACC) and managed for the DoD by the Defense Activity for Non-Traditional Education Support (DANTES). Course work can be done on campus, at military installations and armories, and at a distance by computer or correspondence. Associate, bachelor, and graduate-level degree programs are available. Special curriculum areas include SOCAD (Army), SOCNAV (Navy), SOCMAR (Marines), and SOCGuard (Army National Guard). In addition, SOC operates ConAP (Concurrent Admissions Program) to increase college enrollment of Army enlistees (Army and Army Reserves). ConAP allows you to enlist in the Army at the same time as you apply for college. DANTES also operates its own Distance Learning Program. For more information, contact:
The IRT model underlying ASVAB scoring is the three-parameter logistic (3PL) model. The 3PL model represents the probability that an examinee at a given level of ability will respond correctly to an individual item with given characteristics. Specifically, the item characteristics represented in the 3PL model are difficulty, discrimination (i.e., how well the item discriminates among examinees of differing levels of ability), and guessing (i.e., the likelihood that a very low ability examinee would respond correctly simply by guessing).
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