I live in KC, my gf lives and is from Independence, and Ive.never heard of an attempt on Pres. Truman
American Gunfight: The Plot to Kill President Truman--and the Shoot-out That Stopped It, by Stephen Hunter and John Bainbridge Jr.
Mindset - Skillset - Toolset. In that order!
Attitude and skill will get you through times of no gear, better than gear will get you through times of no attitude and no skill.