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National Guard troops are beginning their deployment along the US-Mexico border. Troops will be deployed in Texas, New Mexico , Arizona and California to help support the Border Patrol with border security.
Monitors along the border areas can check for additional frequencies that might be in use by the National Guard troops. I have heard that some troops have received training in the use of the DHS CBP digital radios prior to being deployed.
Previous troop deployments to the border areas in Texas have included some additional antennas being installed at the Border Patrol checkpoints along major highways. The old checkpoint near Laredo, Texas had what appeared to be a military style VHF low-band antennas, most likely for the National Guard SINCGARS radios, operating from 30-88 MHz.