2019 - 2 Natl Air Tactics channels have changed apparently

Changed heading from "National Interagency Air Tactics Frequencies
(166.6750 MHz, 167.9500 MHz, 169.1500 MHz, 169.2000 MHz, 170.0000
MHz)" to "National Interagency Air Tactics Frequencies (166.6125 MHz,
167.9500 MHz, 169.1500 MHz, 169.2000 MHz, 168.4000 MHz).

per https://www.nifc.gov/PUBLICATIONS/redbook/2019/ExecSummary.pdf