I like to think that Palpatine contacted every clone commander individually for Order 66

In RotS you see Palpatine specifically contact Cody and say "Commander Cody, the time has come" as a live hologram. He could have just pre-recorded himself and sent it to all the clones at once but he enjoyed finally turning on the Jedi so much he contacted all of them one by one.Which was probably a mistake on his part because Yoda felt the death of his fellow Jedi across the galaxy before Palpatine talked to Commander Gree. via /r/StarWars http://ift.tt/2q9IxLz