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| Puerto Rico | 1 BATTALION, 333 REGIMENT | FORT BUCHANAN TEMP ARC, 611 SOUTH TERMINAL ROAD, FORT BUCHANAN, PUERTO RICO, 00934 | 787-707-5805 |
| Puerto Rico | 1 BATTALION, 389 REGIMENT | USAR COMPLEX FORT BUCHANAN ARC #2, 1038 VICTORY DRIVE, FORT BUCHANAN, PR 00934-4616 | 787-707-4538 |
| Puerto Rico | 1 MISSION SUPPORT COMMAND | USAR COMPLEX ARC #1 - 1ST MSC HQ, 353-357 WILSON RD, FORT BUCHANAN, PR 00934-4616 | 787-707-4929 |
| Puerto Rico | 154 JUDGE ADVOCATE GENERAL LEGAL OPERATIONS DETACHMENT - TRIAL DEFENSE | USAR COMPLEX FORT BUCHANAN ARC #2, 1038 VICTORY DRIVE, FORT BUCHANAN, PR 00934-4616 | 910-598-0080 |
| Puerto Rico | 166 REGIONAL SUPPORT GROUP | USAR COMPLEX ARC #1 - 1ST MSC HQ, 353-357 WILSON RD, FORT BUCHANAN, PR 00934-4616 | 787-707-4924 |