What it is is outsourcing your time source to the USAF.  Aka introducing an external dependency.<p>If these people are upset over 13 microseconds, wait until the DoD turn selective availability back on during a war or start adjusting satellite positions to avoid incoming ASAT missiles.<p>Interesting fact: GPS time doesn&#x27;t take leap seconds, etc. into account.  As of last summer, it&#x27;s ahead of UTC by 17 seconds.<p><a href="http:&#x2F;&#x2F;tycho.usno.navy.mil&#x2F;leapsec.html" rel="nofollow">http:&#x2F;&#x2F;tycho.usno.navy.mil&#x2F;leapsec.html</a>