Thanks guys! I did it: I colleceted the destroyed ships to an array and if this array's size greater then 5, I deleted one...
But I found something else...
My boat and crew (driver and transported squad) generate script created by motivation of Mandoble's air support scripts.
And that script transport the squad until the driver is not ready. And when he is ready (in normal situation when he arrive to target position) he drop off the transported squad.
But in fighting situation, if our soldiers shoot to the ship, the driver will be ready
and drop off the squad into the water. It's not a problem, it's VERY realistic. D-day's mood RULEZ!
But the soldiers in the water loose their weapons...
Sometimes I remove the unarmed soldiers, to keep up the fight. But the weapons still there in the water (or under the water - I don't know) .... But if I check the map - ingame - I saw a hundred "weapon crate" in the water. Is this could case LAG? And if yes, how can I delete those weapons in the water?