Tech. Sgt. Rebecca Keylon, a bio-environmental engineering technician with the 137th Special Operations Medical Group, Oklahoma Air National Guard, administers a N95 medical mask fit test to Oklahoma Army National Guard Pvt. Connor Boal, a medic with the Oklahoma Army National Guard Medical Detachment, as part of COVID-19 medical response training at the 90th Troop Command Headquarters in Oklahoma City, April 10 - 11. The training, which included presentations by the University of Oklahoma Medical Center and the Oklahoma County Health Department, will prepare Oklahoma Army and Air National Guard medical personnel for potential missions with their civilian counterparts in response to the outbreak of COVID-19 across the state. (Oklahoma National Guard photo by Staff Sgt. Brian Schroeder)