Cassidy was the CO for 1st battalion of the 502nd Parachute Infantry Regiment. You link up with in in the first mission of Brothers in Arms: Earned in Blood. He is not seen in Hell's Highway and it is unknown if he has survived up to this point. He has strong ties with 2nd Squad and is a high ranking CO for battle plans in Normandy so it is very likely he was occupying Holland or will appear in the upcoming Brothers In Arms game.
- He was known to always give out missions for Hartsock's squad to do.
- He was known to give Hartstock's squads scouting missions. When Will Paige notices Cassidy he knows he has a recon mission comming up.