Call of Duty WWII – All Mementos Locations
Battle of The Bulge
Camera – As soon as you start the mission the camera can be found beside the group of three soldiers directly in front of you.
Comic Book – Near the entrance of the bunker you deliver the ammunition box to.
Wings – Instead of immediately regrouping on Pierson, head to the right and look for a bunker with a box beside it. Inside the box is the las memento.
Ambush
Magazine – Enter the hangar without the airplane in the German base. Look for the memento on the some crates near the back of the parked truck.
Flask – Inside the red barracks building. Look for the flask on a table inside.
Medal – Inside the second overwatch position on the ground floor. Look for a crate with the memento on it.
The Rhine
Canteen – Head inside the tower and make your way to the second floor. Here you will find the canteen beside a dying soldier in the middle of the room.
Stein – Make your way across the bridge and into the second tower. Head upstairs and grab the stein of the table on the second floor.
Letter – Continue up the tower and make your way to the top. Here you will find the final memento on a crate.
Snagging all of the mementos in COD: WWII unlocks the Pieces of History achievement.