The Deputy Commander-in-Chief of Defence Services, Commander-in-Chief (Army) is the second highest military appointment in the Tatmadaw, the unified armed forces of Myanmar, of which official English name is the "Defence Services". After the unification of Army, Navy, and Air Force in 1955, the Tatmadaw had the Chief of Staff system and the branches were led by Vice Chief of Staff (Army), Vice Chief of Staff (Navy), and Vice Chief of Staff (Air), respectively, until 1989. A new system was introduced in 1989 during the reorganisation and each branch is now led by its own Commander-in-Chief. Since then, except in the special case of the 26-day period in 2026, the positions of the Deputy Commander-in-Chief of Defence Services and Commander-in-Chief (Army) are traditionally combined and only one officer is appointed at a time.