Doonesbury by Garry Trudeau for July 29, 1971

Transcript:

Bernie: Boy, B.D., I sure miss that little gal of mine...If only Didi could slip into the camp for a visit... B.D.: Don't hold your breath, kid. To get into this camp, she'd have to disguise herslef, scale four walls, and tunnel under a mine field. Didi: Da, Da!