Physics accelerator mass spectrometry (or spectrometer)
• accident-monitoring system
• (USA ) Agricultural Marketing Service
• American Mathematical Society
• American Meteorological Society
• American Microscopical Society
• American Musicological Society
• Ancient Monuments Society
• Physics anisotropy of magnetic susceptibility
• Astronautics Apollo mission simulator
• army map service
• army medical services (or staff)
• Assistant Military Secretary
• Australian medical services
• automatic music search