Author & former SEAL officer; Richard Marcinko,
www.DickMarcinko.com , wrote about how a SFOD-1 operator shot him through the neck with a 1911a1 .45acp.
The D boy discharged a 230gr FMJ bullet through a airframe cockpit, it went straight up through the chair & in/out of Marcinko.
Marcinko stated the injury was minor & he was T'ed off at the Delta operator more than anything.
FWIW; The LAPD D Platoon(SWAT) will DQ any member who has a AD/ND with a sidearm on duty or off.
My
point is that even highly trained spec ops & SWAT members have training accidents when they leave the finger on the firearm trigger.