Turbo tax 2018 is asking about RMD. I do NOT have 401 K. I receive retirement pay from US Army and from the company I worked for and SSA. Do I have to worry about RMD?

You could very well be receiving an RMD through a pension from the company you worked for. There is not RMD from the Army or SSA. But, the great majority of company retirement plans do have an RMD. In  all likelihood you can just answer yes to the RMD question. See below for a great answer from one of our SuperUsers.

https://ttlc.intuit.com/replies/5381439