I rushed through the first part but slowed down and really took my time in the big Gecko area.
FYI, I didn't bother killing the geckos. Too much effort and ammo. I waited out the waves of troops and sniped them one-by-one until they were all gone. Then I waited until the Geckos had their backs turned (I think there are two of them, right?) and rushed the door into the next area.

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