Visor cap has both front and rear chin straps (often associated with the Air Corps). Worn condition with a nice crusher appearance. Basically, a visor cap made to be a crusher typically has a thin single layer leather visor (Bancroft Flighter being one of the most famous) and a body that was flexible so they could be stuffed into a pocket. Service caps have a thick non-bending visor and a stiffer body. That being said, any cap worn at any time by an officer who flew either as a pilot, navigator, bombardier, or whatever that has been shaped (crushed) and/or had it's ring in the crown removed is also typically called a "crusher".
The US Army Air Force crusher visor cap is typically characterized by its unique "crushed" shape. This cap was designed to be worn comfortably under headsets, allowing for a more relaxed fit and comfort during flights.The cap's design was a result of the pilots' need to remove stiffeners and grommets from their service caps to facilitate the use of headsets, leading to the iconic "crush" look. This cap became a symbol of experience and professionalism among pilots, often worn by ground army officers and general officers as well. The cap is often made from cotton twill construction with a leather visor, sweatband, chinstrap, and gold plate eagle buttons, and is often associated with the European theater in WW2.