Who called from 5712106599

My caller ID said NRS.  When I saw that this number is from Alexandria VA, I googled NRS alexandria va, and it came up with Naval Recruiting Station, Alex, VA.  My son is 18 yrs old.  Perhaps you all have an 18 yr old in your house?  Just wondering

Didn't recognize the number so I didn't answer it. They didn't leave a message.

7:15 pm received a call from NRS per CID. Left it go to answering machine, but they left no message. I never answer any calls if I don't know where they're from.

Number came up as "NRS" on caller ID.  Picked up and hung up on them as they called at 8:10 a.m.

My caller ID read "NRS," not "NRC."  Don't know who or what it is, but I blocked it.