Yeap, they made an alternative currency with Hawaii printed on it, in case the islands fell to the Japanese and they can devalue it:
An explanation for crypto fans about value: musci1223 "These note are both US dollar and not US dollar. The dollar notes in your wallet have value because some government said that it has value. If that government decided that it didn't have any value then there will be no difference between the note and piece of paper. The note we see in the pic is a dollar note that was specifically for Hawaii. So if Hawaii was lost to Japan then US government can declare that all notes will Hawaii on it no longer hold any value. people of Hawaii can keep living as normal but as soon as japan attacks Hawaii and gets their hands on these notes US will declare that these notes don't hold any value so that japan won't be able to use those notes. Basically everything that has a value has it because someone wants it. When demand is more than supply the cost goes up and when demand is less than supply the cost goes down. In this case US made it so that it can cut the demand for these notes in a second to a level that they will be worth less. No one would want a US dollar that US government won't accept."