This article is from the Alien Movies FAQ, by Darryll Hobsonand Eelko de Vos E.W.C.deVos@TWI.TUDelft.NL with numerous contributions by others.
- Possibly, Burke had a fair idea of what has happened on LV-426 so by
sending a small number of soldiers, he was gambling that some would survive
and bring (accidentally or not) an Alien back to Earth.
- The company may have assumed that the colony's transmitter broke down or
the colony itself had suffered a horrible epidemic or just died out. So
the possibility of actually needing more troops was considered to be small.
- Several times in the movie it was implied that this group of marines had
been on these sort of "bug hunts" before (ie: the sign on the side of the
first dropship: "Bug Stomper" and Hudson asking, "Is this gonna be another
one of those bug hunts?" [Aliens]) They had been able to handle "bug
hunts" with one squad before, so why send more this time?
- The squad had enough fire power to deal with the situation, if they had
been fully armed and ANYWHERE other than underneath the primary heat
exchange for their first confrontation (in that confined space) then they
would've had no problem with defeating the aliens.
 
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