IRs should not report for duty prior to the date specified in block 13 or be released prior to the date in block 14 of the AF Form 938.

In cases of changes in the arrival, departure or travel date or location, a modification to the AF Form 938 is required. Any changes to an original order must be coordinated though the IR's AC supervisor and the Detachment orders writer. Upon member’s request in myFSS, the Detachment orders writer will process modification in AROWS-R. The modification is part of the original order and must be included when submitted to the HQ RIO Pay and Travel office when certifying for pay or submitting a travel voucher. Revocations are used before an order goes into effect or before funds are expended to cancel an order. Once revoked, the order no longer exists as an official document.