What are the benefits for a retired veteran's spouse when the veteran passes on?

Regarding the VA: IF he was a wartime ERA Vet, WWII, Korea, Viet Nam
You might, depending on amount of Pensions & Assets you are recieving/have each month, be eligible for improved pension if Assited living is needed down the road.
Now is good time to to consider a IRGT (trust) for your home . and proper planning regarding assets.
The VA CANNOT provide the financial info you need.

As far as social security, you can choose to keep yours, or drop yours and collect your husband's if he has been receiving more than you. Concerning a veteran's widow's benefits, you might get some info at va.gov and check with a VA representative. Your local Va clinic or Va Medical Ctr should be able to put you in contact one.