dr. preble and mr. donnelly, i'd like your reaction to a recent hearing, dr. thomas mankin stated that strategy is about mitigating damage an risk. he feels the u.s. has grown unused to having to take risks an bear costs. do you believe we as a nation have become too risk averse? both of you. dr. preble and mr. donnelly. mr. preble: i wouldn't say risk-averse. i would agree with the rest, that we have become less capable or adept at prioritizing. i think when we do see great risk aversion, especially the desire to not see american sole -- american soldiers be killed overseas, the question is, is the fission mission vital to u.s. national security. i think you're much more risk averse and averse to casualties when there isn't a clear sense of how that mission is serving u.s. national security interests. mr. donnelly: i have a different definition of strategy, to achieve our national security goals, not so much to mitigate risk per se. but i do not believe that this nation is risk averse. if properly led. senator hirono: thank you. thank you, mr. chairman. >> mr