Here is a website with some actual spy code names so you can get the idea - if you're going to write, you need to learn how to come up with your own words and names.
Spy - 2011 I Codename Ball Busted 2-7 was released on: UK: 30 November 2012 USA: 30 November 2012 Japan: 24 August 2013
Infiltrate the enemy headquarters: the B.A.D. control center.
Because the Germans were our enemy.
A spy helicopter main job is to spy in enemy bases in low places and some times it can send troops in there
Market Garden was the codename for the plan to take Holland back from the German occupiers. Market was the codename for the paratroopers who took part in the biggest parachute infantry attck in history behind enemy lines. Garden was the codename for the ground troops that were to cross through Holland and go right into Germany.
To spy on the enemy
A good spy need to good at disguising.
you find a disguise thing and then go in (be careful to not die or get hurt the enemy can get it)
Must not tell the enemy secrets, even if they torture you.
Treachorously deceptive, the guileful spy tricked secrets out of his enemy.
Eating a full meal at dinnertime will thwart evening hunger.
British soldiers were able to infilitrate an enemy camp.