Administering a Booster Robert G. Acosta, a registered nurse at Tripler Army Medical Center, Hawaii, administers a COVID-19 booster to Ryoko W. Kiyohara, family member and beneficiary, May 2, 2022. SHARE: Download: Full Size (4.41 MB) Tags: coronavirus, covid19vaccine Credit: Claudia LaMantia, Army VIRIN: 220503-D-VN697-628.JPG Photo Gallery