This report presents the rationale, development, and standardization of the Air Force Officer Qualifying Test (AFOQT) Form O. The test is used to select individuals for officer commissioning programs, and candidates for pilot and navigator training. Form O contains 380 items organized in 16 subtests. All items are administered in a single test booklet, accompanied by a single machine-scorable answer sheet. Five composites, expressed as percentiles, are derived from various combinations of the subtests: Pilot, Navigator-Technical, Academic Aptitude, Verbal, and Quantitative. Although Form O contains the same composites as predecessor forms of the AFOQT, this form introduced changes in content, format, administration, and scoring. Reliabilities and intercorrelations are consistent with those of previous forms. Form O was standardized to link scores to a normative group based on Form N data. The use of common items on Form N and Form O enabled a series of equipercentile equatings through the common items, resulting in the equating of the entire Form O battery to the entire Form N battery. Raw-score-to-percentile-score Form O composite conversion tables were developed from these equatings, and were implemented for operational use with the introduction of Form O in September 1981 at Officer Training School testing sites and in March 1982 at Air Force Reserve Officer Training Corps testing sites. The data indicate the test is an appropriate replacement for Form N as a selection instrument for Air Force officers. Several tables are appended. (JAZ)