According to wikipedia, any time spent in the Peace Corps means you can’t work as Army Counterintelligence?
From here: “This exclusionary policy is one aspect of the broader, long-standing policy of maintaining an absolute separation between Peace Corps and intelligence activities conducted by the U.S. government. This absolute separation is necessary to protect volunteers’ safety and to maintain the trust and confidence of the people in the countries in which volunteers serve.”
If Peace Corps volunteers returned to the US just to begin serving in the US Intelligence communities, it could lead to the belief that they had been spies all along. This could lead to a significant loss of trust in the Peace Corps as an aid organization, and loss of access to the areas where the Peace Corps conducts its missions.