U.S. Navy Hospital Corpsman Chief Petty Officer Julio Calderin-Serrano, 23D Marine Regiment, 4th Marine Division, Marine Forces Reserve, gains IV access to his patient, Sgt. Timothy Pham, before beginning blood transfusion for the Valkyrie 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)