Let me clear up a common misconception. When most people say writing in code, what they really mean is writing using a cipher. A code is when a symbol, word, or phrase is used to stand for a different word, phrase, or sentence. A cipher is were each letter in a word is represented with a different letter or symbol.
The dash is a punctuation mark that is similar to a hyphen or minus sign, but differs from both of these symbols primarily in length and function.
Best Answer: Okay....here is the real deal with the slashes versus the dash. The slash signifies that the unit has a higher headquarters as indicated in its designation. For example, someone in 1/3 ACR is in first squadron with the 3rd armored cavalry regiment being its next higher command. The dash means that there is no higher headquarters for a units particular designation. For example, someone in 1-72 AR is in first battalion but there is no 72nd regimental headquarters.