2014 notice - 123.975 is NOT natl air tanker base channel

[zerg901]

https://www.doi.gov/sites/doi.gov/files/migrated/aviation/tech/upload/IATB_2014-01.pdf - 1 page notice

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there are a couple of other radio related notices here for wildfire agencies - OAS & Interagency Aviation "Tech Bulletins" - fire aviation technical bulletins

 

[Paysonscanner]

https://www.doi.gov/sites/doi.gov/files/migrated/aviation/tech/upload/IATB_2014-01.pdf - 1 page notice

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there are a couple of other radio related notices here for wildfire agencies - OAS & Interagency Aviation "Tech Bulletins" - fire aviation technical bulletins

Yup! This varies based on states, for example 123.875 is used at all tanker bases in Arizona, but there is another frequency used in New Mexico.