15 years of dropping the breach and main guns on the Bradley Infantry Fighting Vehicles (25MM Bushmaster) and M1 Abrams (120MM Main Gun), There wasn't a time that we failed to use safety wire upon reinstall. While it's true the safety wire's purpose isn't to retain the torque applied to the bolt, it definitely is there to prevent total failure due to a bolt coming out. Properly placed safety wire will not allow ANY bolt that looses it's torque value to rotate itself enough to back out to a point where damage can be done.