On September 11, 2001, the United States was attacked by terrorists. In 2002, the Case factory started a series of muskrat knives in remembrance of this event. These knives would all have unique model number stamps like 629/11 or 829/11 rather than the typical MUSKRAT stamp. 9/11 knives will be made in 2002, 2003, and 2004. Red and blue jigged bone knives would be made with all three tang years. A pearl handled muskrat would be made in 2003 only. Every knife would be sold in an oval tin with the stars and stripes flag on the lid. The blue handled knives all had a stars and stripes belt buckle in the tin, while the red did not have an accessory. The pearl handled knife included a Case collectable medallion. The red handle knife was made in the year 2002 in both the mini-muskrat and muskrat sizes. An interesting 2004 knife commemorates the 35th Anniversary of a Goodyear plant in Tennessee. It also has a 629/11 tang stamp, which was probably a left-over.