In the Secret Service, OST stands for Operations Support Technician.

In the Secret Service, OST stands for Operations Support Technician.

William Bennette later converted cars for personal use that were slated for destruction because they were contaminated with dust from the World Trade Center. He was charged with theft of government property. He pleaded guilty to reduced charges and was sentenced to six months’ probation.

https://www.youtube.com/watch?v=JyYms4J5s98&feature=share