Search the following locations to find the corresponding Reflex Injector:

Mission 2 - "Awakening": After the elevator cutscene you will find a double door that requires a key card Go past it and enter a small room to find the keycard on a dead man Return to the first set of doors to get into the room with the Reflex Injector which can be found on a shelf

Mission 3 - "Discovery": After going through a vent there will be a worker executed by a flamethrower soldier Look on the floor of the bathroom in this room to find the Reflex Injector

Mission 4 - "Withdrawal": Immediately after Intel 26 go down the stairs to the left The Reflex Injector is on a counter Once you reach the elevator that goes up you will see it

Mission 5 - "Replica": After looking at an Abomination with the monitors go through the double doors directly across from it Turn off the valve to a flaming pipe that blocks the room with the Reflex Injector sitting on a shelf before coming into the Abomination monitor room

Mission 6 - "Ruin": During the battle around the downed plane once upstairs go all the way to the back of this same building You will find a box with both Intel and a Reflex Injector on it

Mission 7 - "Top": The Intel and Reflex Injector are both on the same table when you arrive at the closed doors that you have to open When you exit the power armor it is to the left up some stairs and in the room on the table

Mission 8 - "Elementary": It is hidden under a projector in a room in the hallway with yellow lockers and where ghosts start to appear It is the room on the right after the trophy case

Mission 9 - "Nurse's Office": After seeing two soldiers get incinerated look in the bathroom on the right in the hallway where there are some corpses over a barricade

Mission 10 - "Snake Fist": After returning power and stopping the lockdown go back to where Intel 54 was found Go down the ladder where the mechanical arm is moving It will uncover the Reflex Injector for you to pick up

Mission 11 - "Keegan": When you walk upstairs go to your right and back down the stairs You will find the Reflex Injector and armor seen earlier

Mission 12 - "Epicenter": Just before you enter the theatre enter the room where the laser man breaks down the doors The Reflex Injector is to the right on a counter

Mission 13 - "Approach": Look in a little nook away from the major part of the same room as Intel 70 You can reach it by going up the platform going straight off it turning to the right and dropping down a ladder and climbing up another one It overlooks where you initially came in the room

Mission 14 - "Climax": Immediately as you exit the tunnel after seeing "the tree" the Reflex Injector is directly in front of you