In early 2008 PlanetSpace proposed the Athena III launch vehicle to NASA under the phase 2 rebid of the Commercial Orbital Transportation Services ( COTS ) program .
The Athena III launch vehicle is a 2.8 - million - pound - thrust ISS resupply rocket .
In early 2008 PlanetSpace proposed the Athena III launch vehicle , a 2.8 - million - pound - thrust ISS resupply rocket , to NASA under the phase 2 rebid of the Commercial Orbital Transportation Services ( COTS ) program .