Historical images on wikimedia commons i just really like, organised by the date the picture was taken.
United States gun crew of the Regimental Headquarters Company, 23rd Infantry, advancing on German positions, 1918. Finnish soldiers crossing the Finnish-Soviet border in July 1941.
Soldiers of the Finnish 45th Infantry Regiment crossing the Murmansk Railway, October 1941. United States infantrymen clearing out Japanese infiltrators on Bougainville in the cover of an M4 Sherman, March 1944. Moshe Dayan next to commanders of the Paratrooper Battalion 890, 1955. Dutch soldiers repairing the damage from armoured vehicles as a West German Leopard 1 pass during the "King's Gambit" exercise in Germany, 1968.
A Luchs of the West German 36th Panzer brigades Scout platoon in Külsheim, 1978. Soviet military parade celebrating the 66th anniversary of the October Revolution, November 1983. Camouflaged West German Leopard 1A3 during exercise Reforger '83 in September 1983. Lithuanian protesters in the Baltic Way, August 1989. A German Luchs during a training in Vlasakkers, Netherlands,1997. Ukrainian soldiers search Bulgarian Army trucks in Camp Lejeune during the Cooperative Osprey exercise in June 1998.