Around 300 Transportation Security Administration (TSA) workers left the agency just one month into a partial US government shutdown that started on February 14. Approximately 50,000 non-essential TSA employees have been forced to work without pay since then, as they are deemed critical to keeping air travel and transportation safe.
Source: https://www.thedailybeast.com/ice-barbie-kristi-noem-creates-chaos-as-hundreds-of-dhs-employees-quit