According to About.com, a person who has an Armed Services Qualification Test score of 31 on the Armed Services Vocational Aptitude Battery, or ASVAB, is qualified to join the United States Army but not the Navy, Marine Corps, Air Force or Coast Guard. However, in various branches of the services, recruits with lower scores are allowed in under special circumstances.
To qualify for enlistment, the minimum ASVAB test score for an Army recruit is 31, as of 2014. However, occasionally, recruits are allowed in with scores as low as 26. To qualify for enlistment bonuses, a recruit must score at least 50. The Navy requires a minimum ASVAB score of at least 35, but for the Naval Reserves, the qualifying score is 31. The Marine Corps officially requires a test score of at least 32 but occasionally considers those with scores as low as 25. For the Air Force, recruits must score at least 36 on the ASVAB, though this is sometimes lowered to 31 for otherwise-qualified candidates. The Coast Guard requires an ASVAB score of 40 and only lowers this requirement for those with special job skills. These minimum scores are subject to frequent adjustment, so candidates should ask recruiters for current standards.
The Armed Forces Qualification Test portion of the ASVAB includes the basic four test sets of paragraph comprehension, word knowledge, mathematics knowledge and arithmetic reasoning. The results of these four tests determine whether a candidate is qualified to join the various branches of the military. However, the military services use the other sections of the ASVAB exam to determine a recruit's military occupation or career field. Each branch of the service has different criteria by which it calculates career qualifications. This makes a high ASVAB score desirable not just for the ability to enlist, but also for expanded opportunities in the military job pool.