According to the U.S. Office of Special Council, The Uniformed Services Employment and
Reemployment Rights Act (USERRA) is a federal law, passed in 1994, that protects military service members and veterans from employment discrimination on the basis of their service, and allows them to regain their civilian jobs following a period of uniformed service.

USERRA applies to members of the Armed Forces, Reserves, National Guard, and other “Uniformed Services” (including the National Disaster Medical System, Federal Emergency Management Agency, and the Commissioned Corps of the Public Health Service). The law ensures that service members:

1.Are not disadvantaged in their civilian careers because of their military service;

2.Are promptly re-employed in their civilian jobs upon return from duty;

3.Are not discriminated against by employers because of past, present, or future military service.

USERRA applies to both public and private employers. The Office of Special Counsel, in conjunction with the Department of Labor, investigates and enforces USERRA claims involving federal government employers. The Department of Labor and the Department of Justice handle USERRA claims involving private employers as well as state and local governments.

Here is a link to the USERRA