While testing silversurfer's fragmentation changes on explosives (on Arulco Revisited + ver 7535 and latest dir), i encountered a strange side effect affecting merc dynamic opinions:

The enemy radio operator ordered an airstrike on my position.
The mortar explosions sent fragments all over the place, hitting several of my mercs. Each time one were hit, my radio operator/squadleader lose opinion with them by 10, although he had nothing to do with the mortar strike!