Harris Corporation has completed another major milestone in a $1b U.S. Navy communications program competition: logging onto a Milstar satellite using an Advanced Extremely High Frequency (AEHF) Navy Multiband Terminal prototype system onboard a platform that simulates submarine conditions. Harris has successfully demonstrated low data rate(LDR), medium data rate (MDR) and extended data rate (XDR) logon for the various ship and shore terminals -- including submarine mast and periscope versions -- under simulated platform motion consistent with high-sea states.