Combat sentry proto MK IV holotape

Combat sentry proto MK IV holotape is a holodisk in Fallout 4.

Location
It can be found on a terminal in the main building of the Robotics Disposal Ground. The holotape contains the remote control program for a prototype Sentry bot. If the holotape is used on the Pip-boy or any terminal other than the one at the Robotics Disposal Ground, it will show an error and not do anything. Using the holotape's application on-site can send the Sentry Bot to a variety of military installations to kill any and all hostiles in the area.

Engage Defense Protocol
Defend USAF Olivia

Defend South Boston Checkpoint

Defend Revere Satellite Array

Defend Fort Hagen