This Idea I have is that in one of the chapters you can find a HECU privet that wont follow his orders so he try's to leave and Help the Black Mesa Personnel but his squad Leader try's to kill him and If you don't do anything the HECU privet will die but if you save him He will thank the Player and say that he want's to help and you can bring him to you're group they will be stand off ish at first but after they talk to the HECU marine some more They are nicer to him the HECU Privets name is Ryan & well you don't have to save him but you can if you want to. Ryan is one of the Gas mask Marines