The Training Deck is a menu and in-universe location aboard the G.F.S. Aegis in Metroid Prime: Federation Force. In between missions, soldiers in the Federation Force will be able to access the Training Deck in order to participate in games of Blast Ball, or to sharpen their skills in the Shooting Range and/or Combat Sim. Scores achieved in the Shooting Range or Combat Sim can be viewed and compared to friends from the Training Deck. The Training Deck is fittingly located within the deck of the Aegis; this can be seen from the hologram of the ship on the main menu of Federation Force.
"Learn the controls, hone your skills, or take part in some Blast Ball matches."