Assuming that you are talking about the Pahrum Veterans Clinic at 2100 E Calvada Blvd, Pahrump NV 89048, 1848 Big Horn Street in Pahrump, VA is exactly 0.9 miles away.
It will take you about 3 minutes to make the drive, or 17 minutes walking.
I hope that helps,
Clinic Website: http://www.lasvegas.va.gov/facilities/Pahrump_Clinic.asp
Driving Route Map: http://goo.gl/maps/NqbqH