Ghost is the only one allowed to call Soap Johnny, because they're boyfriends. While the campaign teases us with brief exchanges between the two hunks throughout, it isn't until the final act that things really start heating up. Alone is when it all starts to go wrong for our heroes.
The Ghosts are named after Modern Warfare 2 character Ghost and even have masks made after the mask Ghost wears. Riley the German shepherd is named after Ghost's real name (Simon Riley), and the honey badger assault rifle is named after an assault vehicle. The least selling game in the Call of Duty series.