Which branch of the US military uses the Assembling Objects score MOST heavily in determining occupational specialties?

MILITARY OCCUPATIONAL USE of the AO subtest varies by branch. ARMY LINE SCORES using AO: Skilled Technical (ST) — includes AO; used for specialties like healthcare, intelligence, and technical roles; Electronics (EL) — some versions include spatial components; NAVY RATINGS using spatial components: Aviation Machinist's Mate (AD), Aviation Electronics Technician (AT), and similar technical aviation ratings value spatial reasoning ability; MARINE CORPS and AIR FORCE have analogous uses for technical mechanical and electronics roles. PRACTICAL IMPLICATION: If a candidate is targeting technical MOS/AFSC/Ratings, specifically studying to improve AO performance is worthwhile. AO improvements from practice are real but require deliberate spatial practice, not just reviewing text. Candidates who score poorly on AO but want technical roles should: work with 3D puzzles and building kits; study engineering drawings and assembly diagrams; practice folding paper into 3D shapes; use online spatial reasoning apps designed for pilot or engineering aptitude testing — these closely mirror the AO challenge. A one-point percentile improvement in AO can make the difference in qualifying for specific technical positions.