Office of Science Graduate Fellowship (SCGF)Program https://science.osti.gov/wdts/scgf
About National Science Foundation (NSF) https://new.nsf.gov/about
Educational & Internship Programs at SLAC National Accelerator Laboratory https://careers.slac.stanford.edu/jobs-slac/educational-and-outreach-programs
Science Undergraduate Laboratory Internships (SULI) https://science.osti.gov/wdts/suli
STEM Internships and Fellowships at Oak Ridge Institute https://orise.orau.gov/internships-fellowships/index.html
Careers at Sandia National Laboratories https://www.sandia.gov/careers/