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Special and Incentive (S&I) pays provide the Services with flexible additional pays that can be used to address specific manning needs and other force management issues that cannot be efficiently addressed through basic pay increases. Unlike basic pay and allowances, which vary by pay grade and years of service, S&I pays can be used to:
Currently, there are over 60 S&I pays authorized in law. Here are some of the main types of S&I pays.
Hardship Duty Pay (HDP) is an allowance paid to Service members, both Officer and Enlisted, based on duty location, mission specifics, operations tempo, or restriction of movement
For general information on HDP policy, review DoD 7000.14-R Department of Defense Financial Management Regulation (DoD FMP) Volume 7A, Chapter 17 "Special Pay - Hardship Duty".