In common practice, the two-word phrase "code name" is often combined, but this is not formal English. The phrase "code named" would likewise be two words, with code as an adjunct noun.
The test was codenamed Trinity, the device was codenamed Gadget.
Coca-Cola's secret ingredient is codenamed X7.
It was codenamed Longhorn.
The US nuclear program in WWII was codenamed the Manhattan Project due to the location much of the early work was done.The 1st test of a nuclear device was codenamed the Trinity Test. The bomb itself was called "The Gadget"The 1st bomb used against Japan in Hiroshima was codenamed "Little Boy"The 2nd bomb used against Japan in Nagasaki was codenamed "Fat Man"
That bomb was codenamed Little Boy.
Windows Vista and Windows Server 2008.
The codename used for testing the first nuclear weapon in history on July 16, 1945, was "Trinity."
Frank Sinatra was codenamed Napoleon.
What is Codenamed Merchandise 7X and has been a secret since its invention in 1886
Frank Sinatra was codenamed Napoleon.
A MK-I uranium gun bomb, codenamed Little BoyA MK-III plutonium implosion bomb, codenamed Fat Man21 more implosion bombs were scheduled for production and delivery in 1945 had Japan not surrendered.
The Dunkirk evacuation, was codenamed Operation Dynamo by the British.