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| UPT | UPU | UPV | UPW | UQ | UQA |
| UQaM | UQB | UQC | UQD | UQE | UQF |
| UQG | UQH | UQH2 | UQL | UQN | UQQ |
| UQR | UQT | UQTR | UQU | UQY | UR |
| URA | URAC | URAP | URC | URE | URF |
| URG | URH | URI | URIA | URJ | URK |
| URL | URLR | URM | URMC | URN | URNC |
| URNZ | URO | UROP | URP | URPA | URPB |
| URPC | URPD | URPE | URPF | URPG | URPH |
| URPL | URPM | URPO | URPP | URPR | URPS |
| URPT | URPX | URR | URSA | URSB | URSI |
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| USAC | USACE | USAE | USAF | USAFA | USAIU |
| USAL | USART | USASA | USB | USBL | USBN |
| USC | USCA | USCB | USCC | USCG | USCGA |
| USCGAAA | USCGAPA | USCGH | USCGK | USCGP | USCGS |
| USCGSA | USCH | USCHC | USCP | USCU | USD |