I was lucky enough to have most of my work (2013-2016) supported by the DOE NNSA Stewardship Science Graduate Fellowship. Details about the fellowship are provided below:

Brief description from the Krell website

The Department of Energy National Nuclear Security Administration Stewardship Science Graduate Fellowship (DOE NNSA SSGF) program provides excellent financial benefits and professional development opportunities to students pursuing a Ph.D. in fields of study that solve complex science and engineering problems critical to stewardship science.

The fellowship program builds a community of talented and committed doctoral students, DOE NNSA SSGF alumni, DOE laboratory staff and university researchers who share a common desire to advance their science while impacting national defense. The friendships and connections formed while in the program continue to benefit alumni throughout their careers.

Funded by the Department of Energy’s National Nuclear Security Administration, the DOE NNSA SSGF program trains scientists to meet U.S. workforce needs in advanced science and engineering.