Former astronaut Neil Armstrong has issued a strongly worded rebuke  of President Barack Obama, criticizing the president for proposed  revisions to the U.S.' space program. 
 
 Armstrong, along with astronauts James Lovell and Eugene Cernan, called  the proposal “devastating” in a letter obtained by NBC News. Read below  for the full text: 
 
 "The United States entered into the challenge of space exploration under  President Eisenhower’s first term, however, it was the Soviet Union who  excelled in those early years," the letter begins."Under the bold  vision of Presidents Kennedy, Johnson, and Nixon, and with the  overwhelming approval of the American people, we rapidly closed the gap  in the final third of the 20th century, and became the world leader in  space exploration. ... 
 
 "When President Obama recently released his budget for NASA, he proposed  a slight increase in total funding, substantial research and technology  development, an extension of the International Space Station operation  until 2020, long range planning for a new but undefined heavy lift  rocket and significant funding for the development of commercial access  to low earth orbit. 
 
 "Although some of these proposals have merit, the accompanying decision  to cancel the Constellation program, its Ares 1 and Ares V rockets, and  the Orion spacecraft, is devastating. 
 
 "America’s only path to low Earth orbit and the International Space  Station will now be subject to an agreement with Russia to purchase  space on their Soyuz (at a price of over 50 million dollars per seat  with significant increases expected in the near future) until we have  the capacity to provide transportation for ourselves. The availability  of a commercial transport to orbit as envisioned in the President’s  proposal cannot be predicted with any certainty, but is likely to take  substantially longer and be more expensive than we would hope. 
 
 "It appears that we will have wasted our current ten plus billion dollar  investment in Constellation and, equally importantly, we will have lost  the many years required to recreate the equivalent of what we will have  discarded. - Politico Story