Then select Combat Sentry Prototype MKIV Holotape from the list. This tape actually holds the key to control the Combat Sentry Prototype and use it as your escort or bodyguard.
The Stimpack can be used to heal instantly whenever you get injured or hurt during combat.
Quite surprisingly, it will not harm you or shoot you down. Just activate the robot by talking to it.
It must be noted that the companions available in the game are not as formidable as the sentry-bot follower and hence it is imperative that you try unlocking this special ability quite early into the game.
