Summarize:

Band camp is mainly about combining newly-learned drill sheets with music. If you have it memorized, you will not have to rely on your lyre and can focus on marching and formation. This is especially true for incoming freshmen; more effort will be required to learn techniques of marching - playing music you didn't memorize and marching something you learned a few days ago will not mix well. Not only will this strategy be less stressful, but it will save the band less time working individually.
Know your music before band camp starts.