During WWII, Grease Pencils were used to mark out strategies and troop placement on maps.
Lumbricus Lid - Official TF2 Wiki
Buy, Sell, Appraise Wartime Militaria Auction - Civil War, WWI, WWII, Vietnam 7-22
Floating Feature: Cry 'Havoc' and let slip the stories from Military History : r/AskHistorians
Soldier writing hi-res stock photography and images - Alamy
Early WWII (1942) RAF Map of Bremen, Germany with Defensive Positions Marked in Grease Pencil.: Flying Tiger Antiques Online Store
Good condition (see pictures). Used by Wehrmacht NCO during WWII. Original WWII item to you collection. Original WWII item of the Wehrmacht soldier.
GERMAN WW2 WEHRMACHT NCO SOLDIER MECHANICAL PENCIL FOR MAP CASE Rare
World War II anti-malaria poster by Doctor Seuss - Rare & Antique Maps
World War II Maps
Wwii Soldier Shooting Grease Gun On Omaha Beach High-Res Vector Graphic - Getty Images