Sgt. Michael Guerrero, a Marine Forces Reserve finance auditor, clinches his fist to help prepare for his blood donation at MarForRes, April 26. The Blood Center came to MarForRes to give Marines, sailors and Department of Defense civilians a chance to donate blood for hospitals across the Golf Coast. - Sgt. Michael Guerrero, a Marine Forces Reserve finance auditor, clinches his fist to help prepare for his blood donation at MarForRes, April 26. The Blood Center came to MarForRes to give Marines, sailors and Department of Defense civilians a chance to donate blood for hospitals across the Golf Coast.