Dr Wilson, I agree in view of the remarks made by coast watcher, that Engdahl could be suspicious. Whether he is a credible source, I do not know. I tend to judge every article on its own merits. The few articles written by Engdahl which I read were all very interesting and informative. He uncovers details and connections nobody else is talking about. 

By the way, the article by Guilmartin Jr you posted above lacks also any credibility. The last paragraph is either a conscious misleading propaganda or the author does not not know much about the subject himself. I would not consider this piece of writing credible either. Perhaps entertaining.