Photos: Atlas 5 rocket aims for International Space Station

NASA safety advisors on Thursday lauded hardware milestones on Boeing and SpaceX commercial crew capsules, but said multiple technical issues, including problems with parachutes, must be resolved before the human-rated ships are ready to carry astronauts, adding that both companies continue to pursue schedules that appear to be unachievable.

Orbital ATK’s bid to join the U.S. military’s roster of rockets to haul the most critical national security satellites into orbit faces stiff competition from entrenched launch providers and billionaire entrepreneurs, but the company is confident its Next Generation Launch system will win one of three funding agreements the Air Force is expected to award this summer.

United Launch Alliance’s next launch attempt for its Delta 4-Heavy rocket from Cape Canaveral with a top secret U.S. government spy satellite will be delayed to no earlier than early Tuesday.