Army extension courses. Special text : Combat orders : infantry / prep. under the dir. of the Chief of Infantry for use with the Extension … Army extension courses. Special text : Ordnance district organization and administration / prep. under the direction of the Chief of Ordnance for use with the … Army extension courses. Special text : Medical aspects of chemical warfare / prep. under the dir. of the Surgeon General and the Chief of Chemical … Army extension courses. Special text : Sanitation of camps and stations / prep. under the dir. of the Surgeon General for use with the Extension … Army extension courses. Special text : Coordination between the procuring and paying agencies of the army / prep. under the dir. of the Chief of … Army extension courses. Special text : Statement of money accountability / prep. under the dir. of the Chief of Finance for use with the Extension … Army extension courses. Special text : Signal supply / prep. under the dir. of the Chief Signal Officer for use with the Extension Course of … Army extension courses. Special text : Command, staff and logistics : infantry / prep. under the dir. of the Chief of Infantry for use with … Army extension courses. Special text : The Air Corps supply system / prep. under the dir. of the Chief of The Air Corps for use … Army extension courses. Special text : Attack aviation / prep. under the dir. of the Chief of the Air Corps for use with the Extension … Army extension courses. Special text : Combat principles, the Cavalry rifle squad and platoon, mounted and dismounted / prep. under the dir. of the Chief … Army extension courses. Special text : Transportation : rail / prep. under the dir. of the Quartermaster General for use with the Extension Course of …