Final answer:
Gary's decision to join the military as a way to channel his interest in video games into a socially acceptable form is an example of sublimation, a defense mechanism that involves converting socially unacceptable impulses into productive behavior.
Step-by-step explanation:
Gary's decision to join the military to channel his desire to act out violent video game scenarios into a socially acceptable form of behavior is an example of sublimation.
Sublimation is a defense mechanism where socially unacceptable impulses or idealizations are transformed into socially acceptable actions or behavior, possibly resulting in a long-term conversion of the initial impulse.
For example, someone who has aggressive tendencies might take up a contact sport such as football or boxing where they can channel their aggression in a competitive but socially acceptable manner.
Similarly, in Gary's case, his interest in shooter video games is redirected into a socially acceptable form of service by joining the military, which is a legitimate way of dealing with such drives.
Sublimation is considered a positive defense mechanism because it can lead to a productive outcome.