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Hu spent the bulk of his career at the University of Michigan, where he earned master’s and doctoral degrees in mechanical engineering and developed a specialty in researching the quality and productivity of manufacturing systems.

Sidhu went on to earn a degree in mechanical engineering, worked at General Dynamics and Hughes Aircraft, and bought a series of Burger King and Papa John’s restaurants across Southern California.

Doroudi was identified by The Crimson White, a student newspaper, which said that he was studying mechanical engineering.

Mr Wilson was a 20-year-old college band member and mechanical engineering student at Southern University and A&M, Baton Rouge, Louisiana.

“Not only do I have 20 years plus serving this country, I also have a mechanical engineering degree that I graduated with honors. I have two graduate degrees,” she said.