Since your grandson was in the military his answer to the question "military or former military" is "Yes". Deployment status does not matter. Once he continues from that page he will get a follow on question asking about his status on 12/31/2019. Click "Active duty" and then select "left the military in 2019". Additionally, when entering his W2 information, he will also select the "active duty pay" button for his Army W2. Basic pay is considered active duty pay and will get him some tax advantages.
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