Porbably the access to the commisssary/NEX/AAFES at the bases on Guam.
^These. I don't want to bore everyone here who either doesn't care or isn't using Tricare, but if you have specific questions about anything related to any of this, I'm happy to answer them on here or over DM as someone who has spent a lot of time in and out of uniform on Guam, with and without my family. I also did two fairly extensive posts on Guam on here back in 2021:
Guam Based Pilots