Raiden is the player, so his only training is MGS1. Raiden doesn't have experience doing anything that Snake did not do in MGS1.
Wow, after all the MGS videos I've watched about MGS2 and the fact that "Raiden" is the player.. and I never pieced this all together until now
Looks like I will be doing a full MGS playthrough before the TPP release... it will definitely help me through the upcoming TPP media blackout that I have imposed on myself