I recommend that anybody interested in learning how to get good at Alien Swarm and other tactical shooters refer to the US Army Field Manual for Combined Arms Operations In Urban Terrain. Specifically it jumps to Chapter 3, Section III: Clearing . I suggest reading most of this section because I believe it's very relevant to the tactics necessary to survive Alien Swarm.
NOTE: The Wikia editor seems to be failing miserably when it comes to adding external links. Search for "us army urban terrain field guide", should be a secondary link on the Global Security site. I shall try editing this later to add the link.
I first found out about this manual during my days as a Rainbow Six: Raven Shield player. It describes the four person fire team and …
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