Watchstanding regulate the sailors' duty watches and for other purposes (see main article). Unlike civil clock bells, the strikes of a ship's bell do not accord to the number of the hour. Instead, there are eight bells, one for each half-hour of a four-hour watch. Bells would be struck every half-hour, and in a pattern of pairs for easier counting, with any odd bells at the end of the sequence. Watchstanding Watchstanding, or watchkeeping, in nautical terms concerns the division of qualified personnel to operate a ship continuously. On a typical seafaring vessel, be it naval or merchant, personnel keep watch
End of Watch his teens before the two receive the call from dispatch. David Ayer, who wrote and directed "End of Watch", grew up in South Central Los Angeles and has had numerous friends in the LAPD. He had written several films previously about police officers in Los Angeles, but while these depicted rogue and corrupt officers, he wanted to feature honest, ethical police work in "End of Watch". In contrast to his previous works, Ayer wanted to focus on the friendship between Taylor and Zavala and "have all the cop stuff drop away and become secondary to the chemistry of these guys".