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Maybe the HECU was set up simply in case of a breakout in BM?Included in Calhoun's papers are several pages describing bizarre animals, claiming that the facility houses strange specimens from across the globe (they are, in fact, Xen aliens). A point of interest is that the same pages describe how, in the event of an emergency, security officers are required to co-operate with military personnel from the Hazardous Environment Combat Unit, suggesting that Black Mesa has experienced problems with escaped specimens before.