Plus the actual cost of transport and guarding that transport doesn't seem like the profit would actually be worth the risk. It mostly seems like why would we bother, not enough reward for the risk.

Edit: OK, some back of the napkin math, if a tanker holds 11,600 gallons and a barrel of crude oil (42 gallons to a barrel) costs around $85 (current prices), then the revenue of the 69 oil transports would be around 1.6 Million dollars. This is assuming they got current prices, the army basically sent enough soldiers to protect a full convoy, and they didn't have to drive too much of a distance to an oil refinery. After taking into account expenses, that really is a stupid low profit for such high risk (if a soldier was shot for instance it would definitely be in the news). I do not buy the story, way too much doesn't add up from a financial perspective.