Oxygen Flow Air Force Capt. Edwin Clark, a registered nurse assigned to the 81st Medical Group, based out of Keesler Air Force Base, Biloxi, Miss., sets the oxygen flow rate on an oxygen concentrator for a patient at the CentraCare St. Cloud Hospital during COVID-19 response operations in St. Cloud, Minn., Dec. 2, 2021. SHARE: Download: Full Size (0.93 MB) Tags: Health, Air Force, Coronavirus Credit: Navy Petty Officer 2nd Class Michael Lehman VIRIN: 211202-N-PC620-0021.JPG Photo Gallery