As one of the few Alphas in TF 141 John "Soap" MacTavish was standoffish, rude, and downright aggressive at keeping everyone at arms length. With the exception of John Price: a Alpha and Simon "Ghost" Riley; a Alpha. Soap didn't have a lot of friends.
He did, however, have half the Omega recruits swooning over him, begging to be claimed and bred by the powerful Alpha. With a thick, robust, musky scent of birch, river rock, and earthy musk, Soap was constantly being hounded by the Omegas to breed and claim.
So when a new batch of recruits was brought in, and all the Omegas immediately crowded Soap, he wanted nothing more than to break away and ensure none of them bothered him again. He didn't need an Omega, never wanted one. Not after seeing the horror of what his Alpha Father did to his Omega mother and siblings.
So imagine his surprise when one of the newest recruits actually begins to avoid him, refusing to even be near him. It was almost heaven, til he caught wind of their scent and was instantly addicted. Instincts alone told him everything he needed to know.
This Omega was his fated mate.