Indigo Defender A sailor fires a .50-caliber machine gun aboard the USS O’Kane in the Red Sea, Oct. 25, 2021, during Indigo Defender, a bilateral maritime exercise. SHARE: Download: Full Size (0.41 MB) Tags: Navy, Training, Indigo Defender Credit: Navy Seaman Elisha Smith VIRIN: 211025-N-MR124-3297C.JPG Photo Gallery