MARINE CORPS AIR STATION YUMA, Ariz. -- U.S. Marines stationed on Marine Corps Air Station (MCAS) Yuma, receive their COVID-19 vaccination on MCAS Yuma, Ariz., Feb. 16, 2021. Vaccines are being administered in phased approach, prioritizing healthcare workers and first responders, as well as mission critical and deploying personnel. The vaccine is voluntary and Marines are receiving it in order to keep the Corps mission ready. (U.S. Marine Corps photo by Lance Cpl John Hall)