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A-4 (plural A-4s)
- (military) Skyhawk single engine attack aircraft.
- (military) Air material and supply officer.
- 2001, 'Today's Logistics':
- Deployed to a provisional air base squadron as the LG and serving as an A-4 officer...
- (military) Material and supply section of an Air Force staff.
- 1944, 'AAF The Official Guide To The Army Air Forces':
- A-4 or S-4, performs all staff functions pertaining to supply and maintenance.