MacArthur visited Blamey in Port Moresby on 4 October 1942 .
The two agreed to establish a Combined Operations Service Command ( COSC ) to co-ordinate logistical activities .
MacArthur visited Blamey in Port Moresby on 4 October 1942 and the two agreed to establish a Combined Operations Service Command ( COSC ) to co-ordinate logistical activities .