Establishment of psychology as a recognized profession was most clearly signaled by what development during WWII?

Question

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The establishment of the Office of Psychological Personnel (OPP) during WWII was the most significant development that signaled the recognition of psychology as a profession. The OPP was responsible for recruiting and assigning psychologists to military roles, and its creation demonstrated the government's recognition of the value of psychological expertise.

Establishment of Psychology as a Recognized Profession Was Most Clearly