Final answer:
The Air Force form 4009 is used in the Air Force to request changes to allowance standards or to request items requiring approval under miscellaneous allowance source code.
Step-by-step explanation:
The Air Force form used to request a change to an allowance standard or to request an item that requires approval under miscellaneous allowance source code is the Air Force form 4009. This form allows personnel to request changes to their standard issue items or to request new equipment that is not typically included in their standard allowance. The form must be filled out in detail and submitted through the proper channels for approval. It's important for the individual submitting the request to include justification for the change or the new item, as well as any additional supporting information that could aid in the approval process.