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| TYJ | TYL | TYN | TYP | TYQ | TYQ-23 |
| TYQ-69 | TYQ-77 | TYS | TYT | TYW | TZ |
| TZA | TZAM | TZB | TZC | TZD | TZE |
| TZH | TZI | TZO | TZS | U | U/C |
| U/D | U/F | U/L | U/M | U/O | U/S |
| U-SB | U/V | U/W | U5MR | UA | UAA |
| UAB | UAC | UACB | UAD | UADE | UAF |
| UAID | UAL | UALS | UAM | UAOBS | UAP |
| UAR | UARCC | UARM | UARS | UART | UARV |
| UAS | UASB | UAT | UATC | UATD | UAV |
| UAV-C | UAV-C GSC | UAV-CR | UAV-E | UAV-GCS | UAV-MPCS |
| UAV-MR | UAV-SR | UAW | UB | UB1 | UBACS |
| UBB | UBC | UBD | UBE | UBEC | UBIC |
| UBL | UBM | UBN | UBO | UBOA | UBP |
| UBR | UBRAT | UC | UCA | UCAV | UCB |
| UCBU | UCC | UCCA | UCCATS | UCCB | UCCIS |
| UCD | UCF | UCFF | UCHD | UCI | UCITA |