Little Rock Federal Scanning - Updated

I'm set up in Little Rock, Arkansas for the weekend and will have some time for searching the federal bands. Here's some of what I've been hearing:
163.8125, 131.8 - US Marshals
163.8125, 136.5 - US Marshals
166.7125, 146.2 - Unknown repeater, sounds like maintenance types
168.3625, 146.2 - Unknown repeater
168.5250 - Paging, McClellan VA Medical Center
169.5875, P-25 - Little Rock Air Force Base Security Police
173.1375, P-25 - Unknown, likely Little Rock AFB
173.4375, P-25 - Little Rock Air Force Base, sounds like base security police
173.5375, 118.8 - Unknown repeater
173.5875, P-25 - Little Rock Air Force Base, Fire / Crash Net
406.1625, P-25 - Motorola SmartNet trunked system 4628
406.3625, P-25 - Motorola SmartNet trunked system 4628
406.5625, P-25 - Motorola SmartNet trunked system 4628
406.7625, P-25 - Motorola SmartNet trunked system 4628
406.9625, P-25 - Motorola SmartNet trunked system 4628
407.1625, P-25 - Motorola SmartNet trunked system 4628
407.3625, P-25 - Motorola SmartNet trunked system 4628
409.7625, P-25 - Motorola SmartNet trunked system 4628
409.7375, D664 - US Postal Service
415.2000, 103.5 - DHS Federal Protective Service
418.7375, D664 - US Postal Service, input to 409.7375
418.9500, 156.7 - DEA
419.1750, 210.7 - DHS Federal Protective Service, input to 415.2

The UHF trunked system noted above was originally reported as being located at Little Rock Air Force Base. However, I was unable to detect any of these or any other 406-420 MHz signals radiating from the base as I drove around the base perimeter today. The control channel on 406.1625 MHz started to come in very weakly as I drove back south to Little Rock, and was still very weak at my hotel. Since all the radios using this system are running encryption, I'm calling this "Unidentified" for now.

CBP Comm Center Alert

Apparently a suspicious white powder was discovered in a package delivered to the Customs & Border Protection National Law Enforcement Communications Center in Orlando. You can read about the incident here:
http://www.orlandosentinel.com/news/local/newsletter/mu-html/orl-bk-powder120406,0,5204040.story

Although the powder turned out to be harmless, I wonder who would be sending such things to the NLECC.

Note that the CBP NLECC is not the same dispatch center as the US Postal Inspectors NLECC. You'll be able to read more about the USPS NLECC in the January Fed Files.

The Customs and Border Protection NLECC (Pre-9/11 and DHS, known as SECTOR, now heard on their radio frequencies as CHARLIE 100) continues to operate the nationwide communications network for the CBP as well as some other federal agencies that don't maintain their own national communications networks. Other agencies you might hear on the CBP channels include the ATF, Coast Guard, Department of Defense, ICE (Immigration and Customs Enforcement), NOAA and the Department of Agriculture. For a fairly current list of the CBP nationwide radio nets, check the Fed Files blog here: http://mt-fedfiles.blogspot.com/2006_05_28_mt-fedfiles_archive.html