From the National Security Agency Act of 1959 [1]:<p><pre><code> Sec. 15. (a) No person may, except with the written permission
of the Director of the National Security Agency, knowingly use the
words 'National Security Agency', the initials 'NSA', the seal of
the National Security Agency, or any colorable imitation of such
words, initials, or seal in connection with any merchandise,
impersonation, solicitation, or commercial activity in a manner
reasonably calculated to convey the impression that such use is
approved, endorsed, or authorized by the National Security Agency.
</code></pre>
Up to the Supreme Court whether or not it's in accord with the First Amendment. Either way, using the word 'squash' to describe a cease-and-desist letter strikes me as a bit inflammatory.<p>[1]: <a href="http://www.intelligence.senate.gov/nsaact1959.htm" rel="nofollow">http://www.intelligence.senate.gov/nsaact1959.htm</a>