A common phrase used as an expression of gratitude toward the brave heroes of the US Military, i.e., those who selflessly sacrificed their lives in order to guarantee US citizens the freedoms protected within the Bill of Rights.
"Freedom don't come free." (Lyrics from the song, "American Soldier") ~Toby Keith
"Freedom isn't Free" ~Paul Colwell, (1965) formed Up With People; ~Yngwie Malmsteen (2002)
e.g., Freedom 8nt Free, Freedom Ain't Free, Freedom Isn't Free