Insignia

United States:

1. Army
http://en.wikipedia.org/wiki/United_States_Army_enlisted_rank_insignia_of_World_War_II

The U.S. Army enlisted rank insignia that was used during World War II differs from the current system. The color scheme used for the insignia's chevron design was defined as either silver gray on dark blue, olive drab on dark blue, or khaki on dark blue.

1st Grade 2nd Grade 3rd Grade First Sergeant Master Sergeant Technical Sergeant Staff Sergeant Technician Third Grade 1st Sgt. M/Sgt. T/Sgt. S/Sgt. T/3.

					4th Grade		5th Grade		6th Grade
					Sergeant	Technician Fourth Grade	Corporal	Technician Fifth Grade	Private First Class
					Sgt.	T/4.	Cpl.	T/5.	Pfc.

2. Air Force, Naval, Marine


Japan:

1. Army
http://en.wikipedia.org/wiki/Army_ranks_of_the_Japanese_Empire_during_World_War_II

These designs were worn on shoulders as passants between the years 1911 and 1938, then on collars afterwards until 1945, when the Imperial Japanese Army was dissolved.

Officer ranks

All-forces ranks	Collar insignia
Marshal Gensui Rikugun Taishō (元帥陸軍大将?)	As General, plus enamelled breast badge:
General Rikugun Taishō (陸軍大将?)
Lieutenant General Rikugun Chūjō (陸軍中将?)
Major General 陸軍少将 (Rikugun Shōshō )
Colonel Rikugun Taisa (陸軍大佐?)
Lieutenant Colonel Rikugun Chūsa (陸軍中佐?)
Major Rikugun Shōsa (陸軍少佐?)
Captain Rikugun Taii (陸軍大尉?)
Lieutenant (US Army - First Lieutenant) Rikugun Chūi (陸軍中尉?)
Second Lieutenant Rikugun Shōi ( 陸軍少尉?)
Warrant Officer Rikugun Jun-i (Army First Officer) (陸軍准尉?)

2. Navy
http://en.wikipedia.org/wiki/Naval_ranks_of_the_Japanese_Empire_during_World_War_II

The imperial navy lasted from 1869 until 1947, when it was dissolved following Japan's constitutional renunciation of the use of force as a means of settling international disputes.

Officer ranks

All-forces ranks	IJN Insignia
海軍大将 Kaigun Taishō (Naval General or Admiral)
海軍中将 Kaigun Chūjō (Naval Lieutenant-General or Vice Admiral)
海軍少将 Kaigun Shōshō (Naval Major-General or Rear Admiral)
海軍大佐 Kaigun Daisa (Naval Colonel or Captain)
海軍中佐 Kaigun Chūsa (Naval Lieutenant-Colonel or Commander)
海軍少佐 Kaigun Shōsa (Naval Major or Lt. Commander)
海軍大尉 Kaigun Daii (Naval Captain or Lieutenant)
海軍中尉 Kaigun Chūi (Naval First Lieutenant or Sub-Lieutenant)
海軍少尉 Kaigun Shōi (Naval Second Lieutenant or Ensign)