Airmen and Guardians may be entitled to Imminent Danger Pay (IDP) when serving on official duty in an area designated by the Department of Defense as eligible for Imminent Danger Pay. The same entitlement amount is also received by meeting different eligibility requirements that qualify a service member for Hostile Fire Pay (HFP). This entitlement is usually listed together as Hostile Fire Pay/Imminent Danger Pay. A service member can receive Imminent Danger Pay or Hostile Fire Pay but not both. 

Retired Service members are not eligible for Imminent Danger Pay or Hostile Fire Pay.

Imminent Danger Pay webpage maintained by the Department of Defense:
https://militarypay.defense.gov/Pay/Special-and-Incentive-Pays/HFP_IDP/

Hostile Fire/Imminent Danger Pay:
https://www.dfas.mil/militarymembers/payentitlements/specialpay/hfp_idp/

Volume 7A: “Military Policy – Active Duty and Reserve Pay”
https://comptroller.defense.gov/Portals/45/documents/fmr/Volume_07a.pdf

Wounded Warrior Pay section of the Defense Finance and Accounting Services (DFAS) website:
https://www.dfas.mil/MilitaryMembers/woundedwarrior/woundedwarriorpay/

DoD Instruction 1340.09: Hazard Pay (HzP) Program:
https://www.esd.whs.mil/Portals/54/Documents/DD/issuances/dodi/134009p.PDF