The original use was to keep moisture out of the ammunition cases. Because it was waterproof, people referred to the tape as "Duck Tape." Also, the tape was made using cotton duck - similar to what was used in their cloth medical tapes. Military personnel quickly discovered that the tape was very versatile and used it to fix their guns, jeeps, aircraft, etc. After the war, the tape was used in the booming housing industry to connect heating and air conditioning duct work together.
Soon, the color was changed from Army green to silver to match the ductwork and people started to refer to duck tape as "Duct Tape." Things changed during the 1970s, when the partners at Manco, Inc. placed rolls of duct tape in shrink wrap, making it easier for retailers to stack the sticky rolls. Different grades and colors of duct tape weren´t far behind. Soon, duct tape became the most versatile tool in the household.
Duct tape---but I call it West Virginia Chrome because all the people who have body kits on there cars have to use it to hold it on the remaining pieces of their body kits after about a week and a few possums later.