I applied in-person. The process took 3 weeks. I interviewed at Civilian Marksmanship Program (Anniston, AL) in Aug 2016
Interview
Write and prove that you are qualified to coach students, must also have decent scores in air rifle and smallbore, any other outside skills such as megalink help a lot
Interview questions [1]
Question 1
Scores, personal and average, any experience with equipment, also required phone interview with coach