The soldier quote is ludicrous, unless you consider refraining from shooting someone performing an action to be enabling that action.
Soldiers do not make any of those things possible. At most, they prevent external forces (and a few internal ones) from interfering with them - they can just as easily be used to prevent the exercise of those freedoms.
They are neither sufficient nor necessary.
"You can only compromise your principles once. After then you don't have any."
-- Smug Lisp Weeny
"If you want to do good, work on the technology, not on getting power."
-- John McCarthy
"If you’re interested in being on the right side of disputes, you will refute your opponents’ arguments. But if you’re interested in producing truth, you will fix your opponents’ arguments for them. To win, you must fight not only the creature you encounter; you must fight the most horrible thing that can be constructed from its corpse."
-- Black Belt Bayesian
"I normally thought of "God!" as a disclaimer, or like the MPAA rating you see just before a movie starts: it told me before I continued into conversation with that person, that that person had limitations to their intellectual capacity or intellectual honesty."
-- Mike Barskey
"It is the soldier, not the reporter, who has given us freedom of the press. It is the soldier, not the poet, who has given us freedom of speech. It is the soldier, not the campus organizer, who has given us the freedom to demonstrate. It is the soldier, not the lawyer, who has given us the right to a fair trial. It is the soldier, who salutes the flag, who serves under the flag, and whose coffin is draped by the flag, who allows the protester to burn the flag."
-- Father Dennis Edward O'Brien, USMC