单项选择题

On December 22, 2005, Jim Smith, a police officer in Central Park was shot during a drug arrest (逮捕) and died. Shortly afterwards, fellow officer Kim Harold, an 18-year veteran (老 警官) of the force, returned home after work to find a note from his 14-year-old daughter on the dining table.
Dad—This poem came directly from my heart. I love you so much! It frightens and amazes (使惊奇) me that you go out every day and risk everything to provide us with all that we have. I wrote this to express how much I love you and how much lost I’d be without you—Maynell. P.S.: Hey, let’s be careful out there.
Titled "The Ultimate (最终的) Cop", Maynell’s poem was dedicated (献给) "To all the cops in the world who have daughters who love them with all their hearts. And especially to my dad." was about a police officer’s daughter who sees on the nighttime news that her father has been shot. Part of poem: "Daddy, my Daddy, can you hear me cry Oh, God, I need my Daddy, please don’t let him die."
Kim Harold took the poem to work the next day and showed it to his fellow officers. "I’ve never seen so many grown men cry. Some couldn’t finish it."
Harold keeps Maynell’s poem in the pocket of his police jacket. He takes it with him every time he leaves the house for a new shift (轮值). "I don’t want to be out there without it." he said, "I’ll probably carry it with me forever." What does the underlined word "cops" (line 2, para.3) mean