American soldiers advancing through the jungle, while on patrol in Japanese territory off the Numa-Numa Trail, 1 May 1944
The Numa Numa Trail is a trail on Bougainville in Papua New Guinea that runs from Numa Numa near Wakunai, Teperoi and Casuarina Island, a large coconut plantation on the east coast, where it also gave its name to Numa Numa Harbour, over the central mountains of Bougainville to Torokina on the western coast.
↑Benis M. Frank: A Brief History of the 3rd Marines, Marine Corps Historical Reference Series No 35, Historical Branch, U.S. Marine Corps, Washington DC, repr. 1962, pp.9-10 (online version)