US Military bases and other Federal properties, are not subject to the NEC unless specified in contract. Don't get me wrong here... Most of the contracts, spec's and contractors self adhear to code, but don't nessesarilly have to as the Fed's don't recognize it. Funny thing is that as many of these bases and facilities get turned over, many get retrofitted to comply with local codes. So to make it easier, and save a buck in future turn over, they have started following the codes and other building practices more.