Did not receive 1099R from Defense Finance and Accounting Service. Cannot receive via the internet. How can I get 1099R numbers?
You need to get the 1099R from them. You have to call them.
A Customer service telephone number at DFAS is in the upper left on this page:
(Assuming you can't use the Request for a duplicate 1099-R, also showing on that page for some reason)
https://www.dfas.mil/retiredmilitary/