From its first days in Iraq in April 2003, the Army's 4th Infantry Division made an impression on soldiers from other units -- the wrong one.

"We slowly drove past 4th Infantry guys looking mean and ugly," recalled Sgt. Kayla Williams, then a military intelligence specialist in the 101st Airborne. "They stood on top of their trucks, their weapons pointed directly at civilians. . . . What could these locals possibly have done? Why was this intimidation necessary? No one explained anything, but it looked weird and felt wrong."

i recommend this article as a companion piece to the Washington Post article previously recommended which discusses good tactics for fighting an insurgency as learnt in Vietnam, as lessons which have been unevenly applied (if at all).
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'It Looked Weird and Felt Wrong'