Capt. Rebecca Carden calms a horse as Pfc. Angela McCormick prepares to give it a vaccination. U.S. Army Capt. Rebecca Carden (left) calms a horse as Pfc. Angela McCormick prepares to give it a vaccination during a veterinary visit to a farm in Costa Rica on Aug. 22, 2010. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 755990-I-ZOB86-991.jpg Photo Gallery