The free society values the individual as an end in himself, requiring of him only that measure of self-discipline and self-restraint which make the rights of each individual compatible with the rights of every other individual. The freedom of the individual has as its counterpart, therefore, the negative responsibility of the individual not to exercise his freedom in ways inconsistent with the freedom of other individuals and the positive responsibility to make constructive use of his freedom in the building of a just society.
Also, I find it odd that this paragraph, which I like, is in a national security document. Nitze could have just said we are free and they are a tyranny, but he goes on here to define free. I certainly wasn't expecting to find anything I'd like here, and I am finding quite a few sentences which are unbalanced (grave threats are mentioned, but so far none of our abilities to counter them are addressed, entirely one sided).