Call of Duty Modern Warfare 3 (2023) contains 12 Armament Locations. Finding all Armaments unlocks the No Such Thing as Too Many trophy & achievement. They are Kill Streaks, found exclusively in the “Open Combat” missions of the Singleplayer Campaign. The Open Combat Missions feature a map, and the Armaments get marked with blue icons when going near them.
For the trophy you only need to pick up ONE OF EACH and USE IT. There are many duplicate spawn points of most Kill Streaks. Finding a single one of each unique type is enough for the trophy / achievement. Make sure you press D-Pad right 
to USE the armament after picking it up, this is mandatory to unlock the trophy / achievement (doesn’t count if you don’t use it). Killing an enemy with the armament isn’t necessary. Just activate it once, no need to hit an enemy with it.
After using the armaments just have an enemy kill you to save the progress, then you can quit out the main menu and start the next mission. No need to reach a checkpoint or finish the mission.
Collectible Types Overview:
Video Guide
Mission 2: Precious Cargo
Armament #1: Mosquito Drone
Ground level, inside a container, south-west of map.
Armament #2: Bomb Drone
On top of a container, must climb up.
Armament #3: Cruise Missile
Inside the harbor master building, ground level.
Armament #4: UAV
Ground level, inside a container in the north-east of the map.
Armament #5: Sentry Gun
On the ship in the north of the map, in a side room after going upstairs. To get on the ship you need to find the Ascender, which is found in front of the ship next to the rope.
Mission 3: Reactor
Armament #6: Stealth Bomber
On rooftop of a building in the north-west of the map.
Armament #7: Sam Turret
In a yard to the left of where you spawn. Mortar Strike is also here.
Armament #8: Mortar Strike
In a yard to the left of where you spawn. Sam Turret is also here.
Armament #9: VTOL Jet
On rooftop of a building in the south of the map.
Armament #10: Precision Strike
Ground level, sitting to the north of a helicopter main objective you must destroy.
Mission 7: Crash Site
Armament #11: Cluster Mine
On rooftop of a building.
Mission 12: Gora Dam
Armament #12: Chopper Gunner
On an island in the south of the map.
That’s all 12 Armaments / Kill Streaks in COD MW III. After using them all you will unlock the “No Such Thing as Too Many” trophy / achievement. If it doesn’t unlock the game may not have counted the use of an armament correctly, in this case simply reboot the game and reuse all 12 armaments again.
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