Hawaii only taxes the military pay that is already in your federal adjusted gross income. Pay the federal government does not tax, such as combat zone pay and housing and subsistence allowances, does not get added back on your Hawaii return.
There is nothing to apply for. Start your Hawaii return from your federal adjusted gross income and do not add back military pay that was excluded federally.
Your federal return and your Leave and Earnings Statements showing which amounts were paid as allowances or as combat zone pay.