Control schemes
From Halopedia, the Halo wiki
Xbox Controller (Default Controls)
A - Jump
B - Melee attack
X - Reload weapon/Action
Y - Switch weapons
Left Knob - Movement
Right Knob - Camera
Push Left Knob - Crouch
Push Right Knob - Zoom-In
Right Trigger - Fire weapon
Left Trigger - Throw grenade/Fire secondary weapon (Halo 2 only)
"Back" Button - Multiplayer score
"Start" Button - Pause
Directional Pad - Menu Movement
Directional Pad Up - Teamspeak
Directional Pad Down - Lower Weapon (Halo 2 only)
Black Button= Switch grenades
White Button= Flashlight/Camouflage (Halo 2 only)/Teamspeak
Xbox 360 Controller (Default Controls)
A - Jump
B - Melee attack
X - Reload weapon/Action
Y - Switch weapons
Left Knob - Movement
Right Knob - Camera
Push Left Knob - Crouch
Push Right Knob - Zoom-In
Right Trigger - Fire weapon
Right Trigger - Fire weapon
Left Trigger - Throw grenade/Fire secondary weapon (Halo 2 only)
"Back" Button - Multiplayer score
"Start" Button - Pause
Directional Pad - Movement/Menu Movement
Directional Pad Up - Teamspeak
Directional Pad Down - Lower Weapon (Halo 2 only)
Left Button - Teamspeak
Right Button - Switch grenades