If you feel like you've been cornobbled by this JFK paper and are lost in a collieshangie with rhetorical devices, remember to step back, take a breath, and reacquaint yourself with the purpose you are dealing with in each paragraph/section. Focus on how he attempts to fulfill each purpose using rhetorical strategies. Remember that rhetorical strategies can include such things as diction & syntax, appeals (both classical and various, i.e. patriotism, pride, compassion, etc.), choice of detail, figurative language, imagery, organization, etc.
Remember the rhetorical situation: speaker, occasion, audience, purpose(s) as well.
Best of luck with this paper. Don't over-think it. Just identify a purpose and show how he tries to accomplish it in his speech.