Final answer:
The temporary Military organization that assists the port commander in receiving and processing unit cargo in the port staging area is called a POG.
Step-by-step explanation:
The temporary Military organization that assists the port commander in receiving and processing unit cargo in the port staging area is called a Port Operations Group (POG). POGs are responsible for coordinating the movement of personnel and equipment in a port during military operations. They work closely with the port commander to ensure efficient and timely processing of cargo.