Washing Machine Charlie

"Washing Machine Charlie" was a well-known character, however with two manifestations. Bob describes one in his January 14, 1944 Diary entry: 

 "Washing Machine Charlie" paid us a visit - the first since we have
been here.  Tojo’s son was supposed to have been killed at Guadalcanal on the 13th and each month on the night of the 13th a lone raider goes there to dump his load. Quite often he saves part of his load for here. 

The other was also a lone Japanese bomber, whose distinctive unsynchronized engine (resminiscent of an old Maytag) and random bombing were more disruptive and unnerving than destructive. (Google search: 153 results)