Assistant Chief of Staff (ACoS), G-5 (Strategy & Plans) / G-9 (Host Nation Affairs)

The Assistant Chief of Staff (ACoS), G-5/9 serves as the operational integrator for U.S. Army Japan—driving strategy formulation, posture development, campaign support planning, and security cooperation initiatives that shape the joint operational environment. The directorate leads Japanese Alliance coordination, Host Nation Affairs, key engagement activities, and protocol functions supporting senior leader engagements, bilateral ceremonies, and multilateral forums. It also oversees liaison operations with Japan Ground Self-Defense Force (JGSDF) Regional Armies. The directorate enables cross-domain synchronization and advances multinational interoperability with Indo-Pacific partners, while managing professional translation and interpretation services to ensure mission success and enduring bilateral

understanding. (Current as of: July 2025)

G-5/9 Directorate Organization:

• Strategy and Plans Division
  • Strategy Branch
  • Plans Branch

• Political-Military & Engagements Division
  • Political-Military Branch
  • Protocol & Engagements Branch

• Security Cooperation Division
  • Bilateral Engagements Branch
  • Linguist Support Branch

• USARJ Liaison Officers to JGSDF Regional Armies
  • Northern Army LNO: Camp Sapporo
  • Northeast Army LNO: Camp Sendai
  • Eastern Army LNO: Camp Asaka
  • Middle Army LNO: Camp Itami
  • Western Army LNO: Camp Kengun

Contact information:
DSN: 315-262-8540
Within Japan: 046-407-8540
From the U.S.: 011-81-46-407-8540

Mailing address:
HQ USARJ (G-5/9)

OPC 705 BOX 2

ATTN: APAJ-WR

Room W203, Bldg. 101

APO AP 96338-9001