Nana, Baba, and the Silversword

The only thing I know about this photograph of Nana and Baba is that it was taken at the top of Haleakala on Maui: that's the only place where silversword grows. There are other pictures in the same series featuring people I don't know. All seem to have the same logo on their caps. I tried zooming in on it, but couldn't make out what it was. Circa 1947 or so.