April 15th, aka Tax Day, is the filing deadline for federal income taxes in the United States. As a new officer in the Air Force, you will be required to file your taxes before this deadline. There are exceptions and extensions available but you should plan to file well in advance of this date. The Defense Finance and Accounting Service typically make our W-2s available before the end of January through MyPay.
Military One Source offers a simple (and free!) way to file your taxes through its MilTax software. Over the past several years the specific MilTax software has been H&R Block but that is subject to change. The software itself is easy to use and walks you through the process step by step. If you have any questions Military One Source has tax advisors available via phone for free as well.