Opportunities for student interns to work for Mission Support and Test Services (MSTS). MSTS is a contractor to the National Nuclear Security Administration (NNSA). They hold the current contract for the Nevada National Security Site (formerly the Nevada Test Site). The Remote Sensing Laboratory (both Las Vegas and DC) falls under the contract of the Nevada National Security Site.
MSTS Student Programs Link:
Direct link to the internship applications:
(apply to the science positions even as an engineering student) 
Full time positions are also available: