It was after the 2nd giant war the gods were giving out rewards for the prophesied 7.

"Annabeth Chase step forward" Zeus said with a boom in his voice "to you we offer god hood
you would be the lieutenant of your mother and would be put on the Olympian counsil. Do you accept our offer?" Zeus finished

And in an instant Annabeth agreed not even giving Percy another glance. Percy did not seem suprised nor did he seem angry. Instead it was completely the opposite he had a smile on his face knowing Annabeth would be happy.

"Piper Mc. Lean step forward. We offer you the same gift as Annabeth do you accept." And with a bright smile she nodded and said "Yes"

"Leo Valdez, Jason Grace, Thalia Grace, Hazel Levesque, Frank Zhang, Reyna, please step forward." Zeus boomed the rest of the 7 plus some heros of the war asked them the same question and gave them the same offer and all said yes until all that was left was was Percy Jackson.

"Every one but Perseus and Poseidon get out." Zeus said in his usall loud voice.

"Perseus we have asked the others to be apart of or council but we have decided to use a diffrent reward on you."

"Percy your uncle and I have been think about starting a group of super soldiers very similar to the hunters of Artimis. But instead there soul perpose is to protect and sereve Olympus and man kind. And we were thinking that you could be our first super soldier?" Poseidon explained. After two minutes of thinking Percy came to a decision.

" I Perseus George Alexander Leonidas Jackson will take your offer uncle Zeus." Percy said with confidence.

Zeus smiled and nodded and waved his hand and Percy was teleported to a testing facility in Hephaestus' workshop on Olympus. And istantly they put the rest of there plan into action.

When the others were getting close Poseidon started yelling.

"Zeus you basterd I'll make fade for this."

Athena curious on what is going on asks

" What is going where is Perseus?"

"Ask him." Poseidon said with fake venom in his voice.

"Father what did you do?" Athena asked with worry in her voice.

"I blew that runt sky high for turning down yet another offer we gave." Zeus said with fake malice in his voice then it all seemed to come into understanding after several hours of fighting they jus decided to call it a day and go home after they made the new olympains there thrones.

And thus Master Chief was born into this world. Along with the Spartans Of Olympus.

All right guys this is loosely based of GenralPersusJacksons book The Mysterious Spartanso yes there are some similarity but not to many.