Get called often by this number. I don't answer it. Does anyone know who it is?

I receive multiple calls a day from this #.  I don't answer and they never leave a message.

I receive several calls on my work phone for this number. They've never answered and they don't leave any messages.  I called the number after hours and get  a generic message and  to leave my information for a return call.

Some one finally answered, said they were so and so veteran's organization.  Didn't catch the beginning.

same here, does anyone know anything about this number.  They never leave a message.  No one on other side.