Yes that's the mission.
Looking at the TAC View, they destroyed 4 2S3 Akatsiyas, that's it, they left all the tanks undamaged and 2 BM-21 Grad units undamaged.
I don't know if this is a bug or the su-25s screwed up, 3 of them made it to the target, the 1 flew into a mountain, if so, kinda lame that I have to redo the mission and hope they hit their targets, maybe I should carry rockets? as backup.