NASA and its commercial allies are on track to launch astronauts into space from U.S. soil by 2017, unless the government's sequester delays their efforts.

"We're still marching along on our 2017 initial flight for a crewed vehicle," said NASA Administrator Charles Bolden in a teleconference Thursday about the recent SpaceX resupply mission to the International Space Station.

"So far, we don't see any significant impact with the rest of this fiscal year, but if we can't get out of this sequester condition, it could slow down our progress on a commercial crew... We already are talking to our partners about delays in milestones if we don't get the funding that we want," Bolden said.

The sequester did not affect the SpaceX mission, which ended with a successful splashdown of the Dragon capsule on Tuesday, Bolden said.

The Dragon ferried about 1,200 pounds of supplies and scientific experiments to the International Space Station earlier this month. After 23 days docked with the orbiter, the spacecraft returned to Earth, carrying finished experiments and space station trash.

Bolden said he doesn't foresee any delays or problems for NASA caused by the sequester, a set of automatic spending cuts that are set to last until 2021, for this year. However, he said that could change if the sequester goes on longer than this year.

"It could have downstream impact on everything we do," he added.

Bolden also used the teleconference as a reminder about the importance of a commercial cargo program.

He noted that Orbital Sciences Corp., a Dulles, Va.-based company that specializes in the manufacture and launch of satellites, is building and testing a new rocket and cargo spacecraft for its own resupply missions to the space station.

Orbital Sciences is scheduled to launch its first test flight in mid-April. A demonstration mission is planned for this summer and its first official resupply mission is set for the fall.

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NASA : Sequester could delay U.S. plan to launch astronauts by 2017