SAS,
In the case of most MOPOL or army guards or escorts in incidents involving expatriates, I believe that the vast majority of the time they have shown themselves to be poorly equipped (sometimes the MOPOL have only teargas guns), poorly organized, quite capable but totally unprepared to confront hostile armed and dedicated groups willing to assault the compound. They are there for window dressing to deter casual, opportunist, small-scale robbers and to satisfy the insurers of major companies that those companies are fulfilling their duty of care for the security of their employees (thus making sure that life insurances etc., remain valid)
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All eggs, single baskets, CHC, death camp - need I say more?