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WASHINGTON - Neil Armstrong, the first man to walk on the Moon, told lawmakers on Thursday that the end of the space shuttle era has left the US human spaceflight program in an "embarrassing" state.

"We will have no American access to, and return from, low Earth orbit and the International Space Station (ISS) for an unpredictable length of time in the future," Armstrong told the House Committee on Science, Space, and Technology.

"For a country that has invested so much for so long to achieve a leadership position in space exploration and exploitation, this condition is viewed by many as lamentably embarrassing and unacceptable."