The ace of spades has been employed, on numerous occasions, in the theater of war. In the Second World War, the soldiers of the 506th Parachute Infantry Regiment of the American 101st Airborne Division were marked with the spades symbol painted on the sides of their helmet. In this capacity, it was used to represent good luck, due to its fortunate connotations in card playing. All four card suits were used for easy of identification of regiments within the airborne division following the confusion of a large scale combat airborne operation. Battalions within the regiments were denoted with tic marks or dots, marked from top clockwise: headquarters at the twelve o'clock position, 1st Battalion at the three o'clock, etc.