The AI of Arma3 will ignore the **Completion Radius Settings**, which located in the waypoint options! This does not have any effect on AI, while it affects the player!
Repro mission for joined AI-group here - https://yadi.sk/d/m3xtBifD3M3eKG
The Completion radius of Joined allied group has 1000 m, but it not will work. Joined group will join only, when reached final point - "JOIN". Put yourself instead of the AI-commander and this will work immediately, within a 1000 m!
Repro mission for moving AI-group here:
https://yadi.sk/d/VPphaavg3Nqnjv
The Completion radius of moving AI-group has 100 m (first waypoint), but it again not will work. AI-group will switch to second waypoint, only until it completes its first point in fact.