- National security--United States--Congresses (11)
- Chemical detectors--Congresses (5)
- High power lasers--Congresses (4)
- Laser weapons--Congresses (4)
- Lasers--Military applications--Congresses (4)
- Aeronautical instruments--Display systems--Congresses (2)
- Biosensors--Congresses (2)
- Explosives--Detection--Congresses (2)
- Nondestructive testing--Congresses (2)
- Penetrant inspection--Congresses (2)
- Aeronautical instruments--Display systems--Military aspects--Congresses (1)
- Coast defenses--United States--Congresses (1)
- Detection of explosives--Congresses (1)
- Harbors--Security measures--United States--Congresses (1)
- Marine terminals--United States--Congresses (1)
- Photonics--Congresses (1)