in MCA Oral Exam Questions For how long are a Medical First Aid Certificate and Proficiency in Medical Care Certificate valid? by Ship Inspection 13.6k Views 5 years. Share this: See more Previous article Which personnel must undergo training in the use of marine evacuation systems (MES)? Next article Where are the course requirements for Medical Care training? Written by Ship Inspection Leave a ReplyCancel replyYou must be logged in to post a comment.