I hate to be a stickler for detail but where is the evidence for helicopters and barrel bombs? I cannot recall the MSM mentioning such things and logically you would expect them to be all over it.Also compressing a gas into a 50gallon drum is not anything that would pass the most cursory health and safety inspection.
Figures I have seen quote 40psi to burst a conventional steel 55 gallon drum. A standard propane cylinder is rated for closer to 1000psi.

Someone is telling porkies again!