The circumstances of sending a bunch of highly trained, armed soldiers into a locale marginally different to ones they'd been trained to operate in, to check on the status of some civilians who they were almost literally walking on by the point they had to sling their rifles?
No, they wouldn't. The marines were practically there. Presumably, after discovering them dead, they would've done a quick sweep for survivors and bailed. Alas they woke the Aliens, and got ambushed. Gorman's inexperience effected none of this.