Camp Pendleton...???...?

Could someone please tell me what Camp Pendleton is? My brother is getting transferred to Camp Pendleton from the base on Okinawa. One of my friends said that Camp Pendleton is a base where the marines train before being sent to war...is this true? My family is very upset by this and we don't want him going to the front lines to serve a president that my whole entire family hates. Could you please tell me if his chances of going to the front-lines are high? Thanks.