Mission Support and Test Services, LLC

MSTS is a limited liability company consisting of Honeywell International Inc., Amentum, and HII Nuclear, Inc. With more than 3,000 employees, MSTS manages operations at the Nevada National Security Sites for the NNSA’s Nevada Field Office. The company has satellite offices in Los Alamos and Albuquerque, New Mexico; Santa Barbara and Livermore, California; Long Island, New York; and Washington, D.C., along with a small number of employees located in nine other states.

MSTS hires in a variety of career fields, including positions in engineering, science, technical support, project management, human resources, finance, procurement and administration.