I am a movie director and I just received the following movie plot. Could you help me answer this question? If not, let me know by writing "Not answerable". Plot title: Father Goose Movie plot: It's 1942, and the war in the Pacific is not going well for the Allies. At the moment, the Australians are evacuating the island of Salamaua, taking what they can and destroying the rest. In all the confusion, scruffy beachcomber Walter Eckland (Cary Grant) arrives, ties his launch to the pier and begins helping himself to cans of Australian Navy petrol.A young officer, Stebbings (Jack Good), spots him and indignantly asks what he's doing. Walter pauses long enough to look at Stebbings, and say, portentously, "Do you know who I am?" Taken aback, Stebbings admits, "Well, no, I don't." "Well...we'll let it go this time," says Walter, magnanimously, and resumes stacking cans by his boat.In the harbormaster's office, Commander Frank Houghton (Trevor Howard) is talking on the radio to the admiral, reassuring him that everything will go as planned. Stebbings bursts in and asks if Frank knows the cheeky Yank at the far end of the pier. Frank motions him to hush, then tells the admiral that yes, all the coast watcher positions have been assigned...all except for Matalava. But at that moment, Frank catches sight of Walter and his face brightens. He tells the admiral he has found his man for Matalava. As they walk down the pier, Frank tells Stebbings that Walter is a hard-drinking drop-out from civilization, but he knows the islands like the back of his hand and is as sharp as they come.Frank and Walter greet each other in a way that suggests they share a certain amount of history. Frank explains the coast watching service to Walter, and asks him to go Matalava, just for a while...until they can find someone permanent. Walter cheerfully refuses. Frank immediately turns to Stebbings and orders him to confiscate all the small boats on the pier (although Walter's is obviously the only one). At first Walter protests, but he soon realizes Frank will indeed follow through on confiscating the launch, so he cheerfully agrees to go to Matalava. Frank is not fooled. In the next scene, Walter arrives at Matalava...escorted by a... My question: who is the commander of Japanese invasion?
A:
There is nothing stated about a Japanese invasion