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This so far is true for ps3. Let me know if it works for xbox.
*YOU WILL LOSE PERMANENT QUCIK REVIVE if you stop reviving the person in the middle of reviving them.
PROOF
I went into custom games and got quick revive again (17 revives in one game) and stopped reviving my friend in the middle of reviving him and I heard a weird little sound effect and I had lost my permanent quick revive.