Cutthroat. Blue Falcon. Ambitious.

1. Cutthroat
   _Wiktionary

n. An unscrupulous, ruthless or unethical person.

adj. Ruthlessly competitive, dog-eat-dog

2. Blue Falcon
   _Wiktionary

(US, military) A bowlderizing or perhaps humorous euphemism for the derogatory term buddy fucker, a supposed comrade whose actions harm his friends, often for his own benefit.

Quote: To them, he's a Blue Falcon, a derogatory euphemism for "buddy-fucker." Blue Falcons are great soldiers when the commander's watching. But they'll screw you in a heartbeat when nobody else is around.

3. Ambitious
   _Wiktionary

adj. Possessing, or controlled by ambition; greatly or inordinately desirous of power, honor, office, superiority, or distinction