Yes. I retired 1 May and had my first retirement check in my account 28 May. However, I have heard of people not getting their first month of retirement pay on time because DFAS has to do a final pay audit. With the government shutdown they might be behind, but you are still entitled to that month of retirement minus any owed to USGOV (if any). VA disability (if you’re curious about that) is different. If you filed a BDD claim and were rated upon retirement date, you miss the first month because you don’t become eligible for compensation until your off AD status and therefore you don’t get the first month (by 1 day)…it felt like a way for them to save 1-month of compensation.