Army.com features a comprehensive list of military operational specialties available to individuals enlisted in the United States Army. GoArmy.com also features a database with a search function that categorizes MOS listings by type.
MOS listings range from 15R attack helicopter repairer to 94N wire systems equipment repairer. A two-digit number followed by a letter as well as the descriptive position name identifies all specialties.
Each specialty has unique requirements for education, skill, and Armed Services Vocational Aptitude Battery (ASVAB) test scores. For instance, a private hoping to become a 68T animal care specialist needs to have a combined 95 score on the ASVAB, completion of a MOS 91T course, and completion of a high school biology class, as well as full color vision.