Tactical Information Operations / TIOs. Navy Cryptologic Technicians / CTs. Condition : Used and in good condition. This coin is 3 1/2 inches wide by 4 inches high. The “Cipher Key” has special “C” and “T”. And when “CT” is keyed up it sets up secure communications to SEND IT. Never personally given any of the coins. All coins are guaranteed to be in excellent condition unless otherwise specified above. The free listing tool. The item “Special Warfare SEAL Tactical Information Operations Ser# Navy CT Challenge Coin” is in sale since Tuesday, June 8, 2021. This item is in the category “Collectibles\Militaria\Current Militaria (2001-Now)\Original Items\Challenge Coins”. The seller is “rolyat11″ and is located in Panama City, Florida. This item can be shipped worldwide.