U.S. Air Force 1st Lt. Marissa Sunnekalb, a clinical nurse with the 64th Expeditionary Medical Operations Squadron, checks in on a Houston resident after receiving the COVID-19 vaccine at the Community Vaccination Center at the NRG in Houston, Texas, April 26, 2021. Sunnekalb, a Mohrsville, Pennsylvania native, is stationed at Offutt Air Force Base and serves on the post-vaccine observation team as an alternate team leader at the NRG Stadium CVC. U.S. Northern Command, through U.S. Army North, remains committed to providing continued, flexible Department of Defense support to the whole-of-government COVID-19 response. (U.S. Army photo by Spc. Joseph E. D. Knoch/5th Mobile Public Affairs Detachment)