Final answer:
Chapter 7 of AFMAN 91-203 provides guidelines for the storage of fuels in portable containers up to 660 gallons, covering the proper handling, storage, and disposal of hazardous materials.
Step-by-step explanation:
The Air Force Manual (AFMAN) 91-203 is a comprehensive document that covers a wide range of safety areas, including the storage of fuels. For the storage of fuels in portable containers up to 660 gallons, you want to reference Chapter 7, which deals with the Storage of Hazardous Materials. This chapter provides guidelines on how to handle, store, and dispose of hazardous materials properly, including fuels, to ensure safety and compliance with military regulations.