Prison labor is eligible at the rate you normally pay prisoners, plus transport and extraordinary security, food and lodging. National Guard on State Active Duty is eligible for regular time, overtime, benefits and per diem; Guard under federal (Title 32 or Title 10) status is not.
For prison labor on large projects: the prison’s labor policy, names, locations, dates, hours, pay rate and daily activity logs. Source: PAPPG Table 17.
Confirm the Guard activation order says State Active Duty. A change to Title 32 status mid-incident changes who pays.