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[*Jim Maser = pres RKTDYNE] PWR - SSME'S & J2-X -14 engines available at end of STS fly-out [[arrow over STS in right margin]] NASA already owns (cost is 0) [maintained critical skills .... which is necessary] expandible version ~ 30% less - air start SSME? - US needs new 2nd stage engine to get beyond Leo (ie. keep funding/Dev J2-X, regardless of architecture) ~ 2011 RL68A for DSCTA IV's (M+H) * liquids => easier & monitor, assess health, shut down (for human-rating, abort) human-rating RS-G8 + RL10 => sensors [[right margin]]=> GND-testing drives [[left margin]] pref: [DECTA IV for crew [[right margin]] sched/cost = ~ 4 yrs/150-250 M [[left margin]] [shuttle=derived for cargo Space PGM has to serve nat'l need to survive multiple yrs/admins ISS that brings countries of world together problem = things happen too slowly ... lose interest of public & young employees Why human space flight? [has to touch + address every aspect of human survival [therefore] learn things] note = SpaceX [[right arrow]] set up to serve more risk-averse customer not customers [[?]] failures not not an option.