Defense Ops Marines perform defense operations during Castaway 21.1 in Okinawa, Japan, March 18, 2021. Marines train to integrate with the joint force to seize and defend key maritime terrain, provide low-signature sustainment and execute long-range precision fires to support naval operations. SHARE IMAGE: Download Image: Full Size (1.6 MB) Tags: Marine Corps Photo By: Marine Corps Lance Cpl. Joshua Brittenham VIRIN: 210316-M-WW783-536M.JPG Photo Gallery