"Rabbit"
Instead of a target, a rabbit is what intel folks would call the person they are watching and/or following.
Following the White Rabbit | Southern Poverty Law Center
#WhiteRabbit 🐇 (@W4BB17) on Twitter
https://mobile.twitter.com/w4bb17?lang=en
Historian reveals the Second World War hero who inspired the creation of James Bond - Telegraph
http://www.telegraph.co.uk/culture/film/jamesbond/9560403/Historian-reveals-the-Second-World-War-hero-who-inspired-the-creation-of-James-Bond.html
One of Britain’s greatest spies of the Second World War, a secret agent who went by the code name White Rabbit, has been identified as the inspiration behind Ian Fleming’s James Bond.