The betty bomber is a code name for the Japanese Mitsubishi G4M bomber. It had a crew of 7 and a one-way range of 2800km. This one is sitting very close to the airstrip in Truk Lagoon, and was downed sometime before the US attack on the base.
Abe trying to take a dump in the Betty Bomber's toilet
A toilet, presumably from the Betty Bomber since it was laying next to it.