Why Did the US Military Produce Comic Books for the Soldiers in the Vietnam War about the M16?

Let's read DA PAM 750-30, The M16A1 Operation and Preventative Maintenance Comic book. Why did the US Military directly make and publish comics for soldiers to read?

Other sources and information:

DA PAM 750-30
PS Magazine Volume 1 Issue 1 June 1951
Walt Disney - Education or Death (1943)
Private SNAFU - Weapons for War

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