Blood Donation A phlebotomist draws blood from Marine Corps Pfc. Johnny Cadengo at Naval Medical Center San Diego, July 14, 2020, to collect convalescent COVID-19 plasma. SHARE: Download: Full Size (1.15 MB) Tags: marine corps, coronavirus Credit: Navy Petty Officer 2nd Class Erwin Jacob V. Miciano VIRIN: 200714-N-VI515-1042M.JPG Photo Gallery