IMHO, the general guidance is not to simply have the LoR restate the applicant's résumé. The person writing the recommendation should highlight, based on their personal relationship with the applicant, that the application has the qualities required to be a successful cadet. The LoRs I have enjoyed reading included stories of where the applicant overcame adversity, assumed a strong leadership role in a successful project, etc. and those where it is obvious that the author truly knows, respects, and supports the applicant.