Seventh United States Army shoulder-sleeve insignia

"The shoulder patch for the Seventh Army was approved on June 23rd, 1943. The letter "A" (for "Army") is formed by seven steps indicating the numerical designation of the unit. The colors suggest the three basic combat branches which make up a field army - blue for Infantry, red for Artillery, and yellow for Armor (Cavalry). Veterans of the Seventh Army wore a tab reading 'Seven Steps to Hell' under the patch, but this tab was never officially authorized." http://www.trailblazersww2.org/history_seventharmy.htm