Left a message on my voice mail regarding a job.

Someone from the Marshall Space Flight Center used the Center's long distance option to call your number.  Nothing to worry about, even though it says "US Government."  

I work on Marshall...tried to call the small town that I'm from once to inquire about funeral arrangements for a family friend.  I couldn't get anyone to answer my call :p.

I found this information on the web about this number
http://wwwastro.msfc.nasa.gov/poc/poc_ds.html

On my caller id it said "US Government" but no message left either.

didn't leave a voice mail.