U.S. Navy Hospital Corpsman Petty Officer 1st Class Jorge Velasquez, 23D Marine Regiment, 4th Marine Division, Marine Forces Reserve, documents vital signs on patient, Sgt. Marissa Escobedo, as Chief Calderin-Serrano evaluates 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)