Change to non active duty status

Even though you are  "technically"(as you put it)  a civilian ,the way the irs sees it, you were military before the year of 2016 ended so your filing status is military. Here is a link from the irs and then one to follow from TurboTax. Thank you for your service.

Eligibility for Military Tax Benefits  https://www.irs.gov/individuals/payment-plans-installment-agreements

You must be serving or have served in one of the following organizations to be eligible for military tax benefits. For specific information on benefits, go to the Military home page.

If you are an active duty or reserve member of an armed force listed below, you may be eligible for military tax benefits. Recently retired or separated members may also be eligible for benefits.

• United States Army (including Army Reserve and Army National Guard)
• United States Navy (including Navy Reserve)
• United States Air Force (including Air Force Reserve and Air National Guard)
• United States Marine Corps (including Marine Corps Reserve)
• United States Coast Guard (including Coast Guard Reserve)

https://turbotax.intuit.com/personal-taxes/online/military-edition.jsp