The DOD is primarily interested in propulsion systems as either station keeping for large satellites or primary propulsion for small-sats. The EMPT has application for small satellite main propulsion and LEO-GEO transfer in earth orbit due to its high specific power, mid-mission power scaling, and expected high Thrust-to-Power (T/P). Additionally, the high specific impulse operation of the EMPT will have applications for large telecom and military satellite station-keeping. Finally, the variable power and thrust nature of the PDA has direct application to modern Operational Responsive Space (ORS) missions that require a single propulsion unit capable of in-orbit mission changes. The high specific impulse operation of the EMPT will have applications for large earth observing science missions as a replacement for high-mass station keeping thrusters when coupled with ultra-light solar arrays. Additionally, as more (and less massive) power is available for interplanetary science missions, such as advanced radioisotope power (REP) systems and NASA ultra-flex solar panels (SEP), electric propulsion can find even larger roles. A low mass, 1 kW REP propulsion system would enable a host of deep space Neptune and Pluto orbiter missions. An advanced, variable power SEP system would enable small sample and return and orbiter missions from asteroids and planetary moons. Additionally, the variable power and thruster nature can apply immediate mass savings on any interplanetary mission with variable power requirements. The dual mode nature of the PDA will allow for use as both primary propulsion and station keeping for a given mission. Finally, the ability to rapidly and cheaply increase the power of a space-qualified thruster by a factor of ten allow for the propulsion technology to cheaply match and grow with the available power for NASA science missions.