is julie van kleeck, vice president advanced space and launch programs at aerojet rocketdyne. mr.rank culbertson, president of space systems, orbital atk come and mr. jeff thornburg senior director of propulsion engineering at spacex i think all of you for this big industry and providing a perspective on national security. i know it takes time and energy to prepare for these things and its convenience to come after but helps us in developing protocol so i appreciate your service. this is our second hearing. we conducted on space. we are dedicating the time for this topic because of its significant our national security. without an effective space launch program we list all the benches we came from space capabilities, losing space for our warfighters is not an option. the rt policy and acquisition questions regarding the future national security space need to be addressed. as we said before i'm committed to ending our reliance on russian rocket engines for national city space launch. i believe we must end our reliance in america protects our access to space that protects the taxpay

impressive is how much they have embraced that across the board from blue origin to ula to aerojet rocketdyne to orbital atk to spacex, to embrace back to look at that place. so the competition was imported. but when you do pull an open competition had to go to the process to make sure it is full and open answer across industry. that does not happen overnight. i would just make those two comments for the record. >> mr. chairman, you asked whether or not we should replace the rd-180 with proven technology. as the previous panel did express, we did not have the capability within the united states today to replace the engine. so what have we come up with will be a new engine the ar1 be-4 for both mentioned. from our point of view replacing an engine has to effect on the overall capability that we plan to deliver. we must verify the impacts of any changes to any component in the system especially on the rocket itself and our ability to deliver that capability to orbit. so combined with what general hyten just mentioned our approach is to look at the total capability, total system that will result