SECURITY-COMS are little hologram note pads you find within the campaign, once you have collected one, it will automatically be saved and will not appear in future playthroughs. They are cumulative, so you can just pop into a chapter, pick up the SECUTIRY-COM and back out, it will save. You can check how many you have and need by going to the Chapter select menu, it will tell you how many you have left in a chapter and also within each act. There are 40 in total. Here is a video thanks to PowerPyx.