Maybe so you don't offend anyone?
Answer: American tactics in Vietnam can be summed up by the acronym BEAST - Bombing, Escalation, Air and artillery, Search and destroy and Technology.
Explanation: This helped the American's by taking out towers which is communication so squads and camps were of on there own this helped America to help them get communisim down.
I believe its Rapid price changes.
This iron was essential to make the machines and other equipment necessary for development