 As Soon as Possible | Military |
| Army Scientific Advisory Panel | Technology |
| Automated Shipboard Aerological Program | Technology |
| Automatic Switching and Processing | Technology |
| Aeronautics and Space Access Page | Science |
| Ariane Structure for Auxiliary Payloads | Science |
| Automated Stafford Application Processing | Business |
| Automated Statistical Analysis Program | Military |
| Absent Student Assistance Program | Education |
| Accelerated Situational Awareness Prototype | Science |
| Accelerated Surface Area and Porosimetry | Common |
| Accesspoint Corp. | Organizations |
| Administrative Support/Advancing Productivity | Military |
| Adolescent Self-Assessment Profile | Organizations |
| Advanced Scientific Array Processor | Science |
| Advanced Seismic Array Program | Science |
| Advanced Stepper Application Program | Science |
| Advanced Systems Applications and Products | Common |
| Aerospace Safety Advisory Panel | Science |
| Aerospace Safety Automation Program | Science |