U.S. Navy Hospital Corpsman Petty Officer 1st Class Jorge Velasquez, 23D Marine Regiment, 4th Marine Division, Marine Forces Reserve, preforms a “blood sweep” on patient Sgt. Marissa Escobedo as Chief Calderin-Serrano monitors her breathing for the Valkyrie whole blood transfusion program in San Bruno, CA on Jan. 10, 2024. The Valkyrie Program is a course designed to teach attendees how and when to apply a whole blood transfusion to casualties in a combat environment. (Courtesy Photo)