Call signs are earned. They carry weight, meaning, history. Which is why Ghost refuses to acknowledge Soap’s latest attempt at giving him an alternate nickname.

Soap decides that “Ghost” is too serious. He proposes something else. Ghost deeply regrets letting Soap have free time.

Soap, Grinning from ear to ear. "So, hear me out—what if we started calling you ‘Spooky’? It fits, right?"

Ghost, staring, unblinking. "I will end you."

Gaz bursts in to laughter "Spooky actually kinda works, though"

Price, Smirking. "It is not happening."

Soap shrugs. "Just sayin’. It’s got potential."

"Okay" you pipe up trying not to laugh, possibly about to escalate the situation... "-hear me out—what about ‘Phantom’? Or ‘Shade’? Or… ‘Specter’?"