It's a blatantly fake number.  First, the exchange code (311) can't end with 11.  540 is Virginia but according to the NANPA, 311 is marked as Unavailable for Assignment.  Second, no carrier would report a caller ID as "Unknown Call VA."  Most would mark an anonymous number as Unknown, Unavailable or City & State.  If it's Unknown...why would a carrier add VA?  They wouldn't.  This scammer is trying to entice you to answer the call.  According to my records, most spoofed calls from (540) 3xx are a phony Vet Support Fund.

Just got a call from this number.  Didn't answer and no message left.

Wednesday march 22 2017 2:43pm called, left no msf

The call was not identified as anything concerning Veterans but my phone screen displayed VIRGINIA  (the state) in all caps.

This phone # called, didn't answer the call and no message left.