War Plan Orange
In late 1920, Lejeune and his senior staff focused on review and revision of war plans that were prepared for use in the event of hostilities with Imperial Japan; this work included revising War Plan Orange. As part of this effort, Ellis produced the prophetic document, "Operation Plan 712 – Advanced Base Operations in Micronesia", which underscored that in the event of hostilities with Japan, the US would require advanced bases to support its fleet. The Territory of Hawaii constituted the 'only' support for the United States Navy due to the lack of naval facilities in the US possessions of the Philippines and Guam.