Under the "Guaranteed Job" program, the applicant is guaranteed training in a specific AFSC (Air Force Job). Under the Guaranteed Aptitude program, the applicant is guaranteed that he/she will be selected for a job that falls into one of the designated aptitude areas.
The Air Force has divided all of their jobs into four aptitude areas (General, Electronic, Mechanical, and Administrative). It is unfortunate, but true that a majority of Air Force jobs (approximately 60 percent) are are reserved for individuals joining under the Guaranteed Aptitude program. Therefore, many of the available jobs are not released to the Air Force Jobs Counselor at MEPS. Instead, they are "reserved" and offered to recruits in basic training, who enlisted under the Guaranteed Aptitude Program.
For more details see Part 3 of the article, What the Recruiter Never Told You.
