Description: The patch is circular, with two playing cards, the Ace of Spades on top of the Jack of Spades, centered on a green field. The white number “21” is beneath the cards and the patch is surrounded by a black border.
Significance: The Ace and Jack of Spades form the winning combination of 21 in the card game Blackjack, representing both the squadron’s number and nickname. This winning hand symbolizes the ingredients of character necessary to attain success: skill, spirit, ability, and fellowship. The green color represents the mixture of gold and blue, the colors of the classes of 1963 and 1964 that commanded the squadron when the patch was designed and adopted.
History: This patch was adopted by the cadets of Twenty-One in 1963 and has been in use since. It was designed by Cadets Hank Hoffman and Grant Callin.
Nickname: "Blackjack"
1965 –