"I've got your six.": This expression is commonly used in law enforcement. It refers to having someone's back or watching out for them.
"There is no 'I' in law enforcement.": This is one I came up with on my own but I think many in law enforcement would agree. Refusal to work together in law enforcement can have tragic consequences.
"I'm putting you in charge of...": Unless a person is only using this phrase to get me to do their work, I consider this a great honor since it means the person trust my ability.
Words I wish people would use more often
"I understand your point of view.": Saying you understand someone's point of view tells me that