IIRC, something similar happened back in the 80's, or early 90's, at Fort Hood with a bunch of Apaches getting knocked about by a microburst (or similar sudden and intense wind event). There may have been other helicopters damaged; the photo that made the rounds among the Navy safety folks briefing us about featured Apaches. FWIW, the MH-60 in the top picture in the OP does not have the blade boots on, which makes me suspect that they were planning on flying it at some point that day.