The Instructional Cadre badge was introduced in 1920 to be worn by NCOs and Warrant Officers assigned to the Instructor Cadre to teach the Militia. It was worn up to the end of the Second World War.  A cloth version of this badge also existed.

Instructor's Badges - 1943 War Dress Regulations

During the Second World War, two types of badges were worn - Instructor's Cadre (or I.C.) badges, and Assistant Instructors (A.I.)  These badges were to be worn only on the right arm of Battle Dress Blouses, Service Dress and Khaki Drill Jackets. They were not to be worn at all on khaki cotton shirts, work clothes, greatcoats or cloaks. The badges were to be placed below rank badges (but above Service Chevrons) by Warrant Officers and above rank chevrons by NCOs. Further orders in 1944 added that the Instructor's badge was to be 3/4 inch above the point of the V of NCO rank chevrons, and below all other badges.

Soldiers appointed to the Instructional Cadre were ordered to wear the Instructional Cadre Badge, consisting of the letters "I.C." in monogram form within a wreath of maple leaves, surmounted by the crown. Other instructors at training centres, schools, formations etc. were to wear an Assistant Instructor badge consisting of an "A.I." in monogram form surmounted by the crown.

In late 1942, orders further specified that Instructors and Assistant Instructors appointed to the Instructional Cadre would wear the "I.C." Badge, while personnel other than IC filling authorized appointments as instructors on an establishment, would wear the "A.I." badge. As well, Skill-at-Arms badges were ordered worn above the I.C. and A.I. badges. The orders also specified that to readily identify instructors, a maroon arm band three inches wide was ordered worn by men doing instructional duties. The armband was to be worn on the right upper arm, and was not to be worn off of parade.