80s Trivia: Who was Reagan referring to when he said, 'slipped the surly bonds of Earth to touch the face of God'?

Ronald Reagan was called the Great Communicator for a reason: simply put, he gave some of the greatest speeches in US History and inspired a nation that had endured a rough decade in terms of political leadership.  In one of his greatest speeches to the nation, Reagan paraphrased  the poem "High Flight" by John Gillespie Magee when he said: "slipped the surly bonds of Earth to touch the face of God."  Off of Pocket Trivia: 80s Trivia: Who was President Reagan referring to?  The 1986 Mets, the Challenger Astronauts, Pan Am Flight 103 victims or 1983 Beruit Bombing victims?

If you said the 1986 Mets: Really?  I'm kind of annoyed at myself that I couldn't come up with a better answer.

Anyway, the answer to one of this one is the 1986 Challenger Astronauts.  The Challenger exploded during lift-off on January 28, 1986, killing all seven astronauts on board.  President Reagan had been scheduled to give his State of the Union speech that night, but delayed the speech and instead addressed a grieving nation from the Oval Office.  That speech is below: