I mailed them to ask for permission and the answer was:

As far as I know, these photos are all public domain and you may use them. The author of this website has retired and isn't available to make verification. However, please copy and save them quickly if you haven't already because this website is going to be removed.

Good luck with your project. Sincerely,

• • **

Web Services California National Guard

	This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
Denne filen har blitt identifisert til å være fri for kjente restriksjoner under lov om opphavsrett, inkludert alle relaterte og nærstående rettigheter.

https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse