It would also have fragment holes in it and there were none. Why wouldn't the missile strike an engine or a heat source? What is the range of a shoulder fired missile. What is the launch signature? Why did no one see the launch if there were so many witnesses?
PETN is one of the strongest known high explosives. It is more sensitive to shock or friction than TNT or tetryl, and it is never used alone as a booster. It is primarily used in booster and bursting charges of small caliber ammunition, in upper charges of detonators in some land mines and shells, and as the explosive core of primacord.