cph or c/p/h - campaigner/progressive/hardcore - three stages of what is often referred to her as "campaigning", or the other side of the hobby from mainstream. Similarly, some break down the mainstream side into three stages f/m/a - farb/mainstream/authentic.

PEC - period/everyday/common - a concept for basing one's impression on what would have been seen a large portions of the soldiers rather than a very small minority.