From Transformers: Dark of the Moon
] We gotta get Sentinel outta here, he is the key to all this...
Indeed I am! What you must realize my Autobot brothers, is we were never going to win the war! For the sake of our planet's survival, a deal had to be made... with Megatron!
] Sentinel... what have you done?
] I hereby discharge you from duty!
[shoots Ironhide again