I'm pretty sure it is common for military to practice radar tracking and lock on to civilian traffic even in the west.
As for mistakes being made - read Dan Hampton's "Viper Pilot". On returning to Turkey after the first strike against Mosul, with dozens of aircraft stacked over the base waiting to land the guys saw a SAM launch. One of the Patriots defending the base. Seems someone left it on "auto" and when it saw all the radar returns it launched. Fortunately didn't hit anyone nor did any Weasel strafe the battery.
This for an army with 6 months or so notice to go to war.