A guy I know voted for President Trump because he’s afraid of nuclear war. The incoming Secretary of Defenses highest military ranking is Major. Skip the fact that he’s a news personality. Service wise:

For scale, he isn’t a - 

A General 
A Lieutenant General
A Major General 
A Brigadier General (that’s like a senior staff general) 
A Colonel 
A Lieutenant Colonel 

He’s literally the lowest ranked officer you can be.