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- UAL 1
- UAV 1
- UCI 1
- Ucrânia 5
- UE 3
- Ukraine 3
- Ultima Ratio 1
- ultima ratio 1
- Ultrawideband 1
- Uncertainty 1
- unconditional positive regard 1
- Underwater acoustic 1
- Underwater Acoustic Communications 2
- underwater archaeology 1
- Underwater communications 1
- UNHCR 1
- União 1
- união de facto 1
- União Africana 1
- União de facto 1