 The LCROSS Lunar-impact water detection mission in 2009 took advantage of the structural capabilities of ESPA ring to attach all six of its science experiments, command and control systems, communications equipment, batteries, solar panels, and even a small monopropellant propulsion system to implement pre-impact payload separation and control.The ESPAStar is a comparable design concept by Orbital Sciences Corporation.Its maiden flight was on the AFSPC-11 mission as the EAGLE secondary payload.