I could not see where anyone responded toy our question, is CASU11 the same as CASU11 (f). They are in fact the same. The (f) means forward so for instance my dad was in CASU44. It was CASU44 from inception at Point Magu California to Hawaii. Once they made it to Titian Island they became CASU44 (f). Hope this helps. You can fond more information on my website, www.casu44.com