In 1942 army regulation ordered a plain white five pointed star, as the national symbol, it was seen in all theatres from 1943 and by 1944 was the most common national identification sign. The star point was supposed to be facing rearwards on flat surfaces, upwards on a glacis. 
In armored units, the white star was often painted out or a circle around the star was added, to avoid looking like a German cross at distance.
 
The decals have been specificaly sized to fit GHQ Shermans. 
 
Each sheet contains 80 star and stripe decals, enough for 40 tanks.