U.S. Marines and Sailors with the Basic Reconnaissance Course 2-18 conduct helocast insertion training aboard Naval Amphibious Base Coronado, California, March 8, 2018. Helocast training is a graduation requirement which provides flexibility and maneuverability and will prepare students for basic recon insertion. - U.S. Marines and Sailors with the Basic Reconnaissance Course 2-18 conduct helocast insertion training aboard Naval Amphibious Base Coronado, California, March 8, 2018. Helocast training is a graduation requirement which provides flexibility and maneuverability and will prepare students for basic recon insertion.