As to the Asiatic Pacific Campaign Medal, it was awarded for 30 days of service in the Asiatic-Pacific Theater in specified campaigns between December 7, 1941 and March 2, 1946. I presume it could be awarded to a man from any of the services, not just the Navy. The medal was established November 6, 1942.
There were 21 designated campaigns associated with the Asiatic-Pacific medal. One bronze star was awarded for participation in each additional campaign after the first one. Therefore your father must have served at least 30 days during each of four of the designated campaigns. A list of the applicable campaigns and their respective dates can be found at http://www.soldiercity.com/product-exec/product_id/12845
I haven't yet been able to pin down what a boat pool was in general or anything about boat pool 15-1 in particular but will continue searching. Can any of you Navy Armed Guard vets shed any light on this? From what I have found so far I would say boat pools did not apply to the Armed Guard but were relevant to operations in the fleet.
Ron Carlson, Webmaster
Armed Guard website