If you are a Virginia state employee called to active duty and your military pay is less than your state salary, the state pays you the difference. The supplement makes up the gap between your base state salary and your gross military salary plus allowances while you are on military leave without pay.
Apply through your agency’s human resources office when you go on military leave without pay, and give them your orders and your military pay information.
Your active duty orders and documentation of your gross military pay including allowances, so your agency can compare it with your base state salary.