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In page Mechanized infantry:

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In the Vietnam War, the M113 was often fitted with extra armament and used as an ad hoc infantry fighting vehicle. Early operations by the Army of the Republic of Vietnam using the vehicle showed that troops were far more effective while they were mounted in the vehicles than when they dismounted.[citation needed] American doctrine subsequently emphasized mounted tactics.[citation needed] The Americans ultimately deployed a mechanized brigade and ten mechanized battalions to Vietnam.