The IRS has issued Publication 3, Armed Forces’ Tax Guide for use by members of the military. While this guide does not cover every tax provision relevant to military personnel in detail, it addresses many important military-specific tax situations.
According to the IRS, the term “U.S. Armed Forces” includes the following:
Publication 3 also covers other topics, such as itemized deductions and home sales, which pertain to all taxpayers but may be of high interest to military personnel.
Military personnel who are expecting a refund check by mail should ensure the IRS has their current mailing address on file. This is especially important if they are due a federal income tax refund and moved after filing a federal tax return, but before they received the refund check. The IRS offers more than one option for updating a mailing address.
Sources: IRS Website