Minimum Qualifications (Screen Out Element): for Third Mate, Dredge Control Officer, Hopper Dredge You must possess a current United States Coast Guard Merchant Mariner Credential (MMC) Third Mate, Unlimited Oceans, STCW, Medical Cert or higher and a current Transportation Worker Identification Card (TWIC). For each relevant work experience, make sure you include the employers name, job title, start and end dates (include month and year), for qualifications purposes, the number of hours worked per week, and a brief description that show you can perform the tasks at the required level listed in the job announcement.