Kennedy most likely uses the clause "beachhead of cooperation may push back the Jungle of suspicion," to convey the following Idea.
Peace will be preserved by pushing back against enemies.
Cooperation is the first step in lessening misunderstanding between adversarial nations.
Troops that land on the beach will overcome enemies hiding in the jungle.
Suspicion is likely to choke the efforts of any cooperation,

The author most likely included these details in order to read the excerpt from "justin lebo." it was a bmx bike with a twenty-inch trame. its original color was buried beneath five or six coats of gunky paint. now it showed up as sort of a rusted red. everything the grips, the pedals, the brakes, the seat, the spokes-were bent or broken, twisted and rusted, highlight the amount of money justin had to spend to restore the bicycle llustrate why justin wanted to give the bicycle away to someone else. emphasize how hard justin had to work to restore the bicycle. show why justin may have made a mistake in buying this bicycle