Training a new breed of soldiers, especially ones destined to preserve an entire species, is no easy task. For Chief Petty Officer Franklin Mendez, trainer of the Spartan-II’s, this was not an exception. In fact, it’s the intense vigor and dedication required in training the Spartan-II’s that confirms that such a task is simply not achievable by a mere mortal man–
That the only person capable of inspiring six year old humans into forgetting their lives, submitting their freedom, and undergoing brutal augmentations is the one, the only… Shia LaBeouf.
As the young John-117 prepared to fight the four ODSTs in that boxing ring, only Shia LaBeouf yelling “DO IT. JUST DO IT.” would be enough to lend John the confidence to strangle those ODSTs with their own spinal cords. As the Spartans sat down for the augmentative processes that would wipe out more than half of them, only Shia LaBeouf roaring “DON’T LET YOUR DREAMS STAY DREAMS” would be enough to propel those 75 children to undergo the horror awaiting them. And as the members of Blue Team found themselves having to leave Sam behind on that Covenant ship, only Shia LaBeouf screaming “YESTERDAY, YOU SAID TOMORROW. SO JUST DO IT.” would be enough to give Blue Team the bravery to let their squadmate die for the greater good.
Thus, it can be concluded that Franklin Mendez is actually Shia LaBeouf.