The letter should identify the employer, the profession by its USMCA name, the specific duties, the location, the salary and a period of stay not exceeding three years. It should state that the position requires a registered nurse and confirm the licence the applicant holds. Vague or conditional language can create avoidable questions about whether qualifying employment is available.
What to ask the employer to put in writing
Ask the hospital's recruiter for a letter on letterhead that names the legal employing entity, states that the applicant is being engaged as a Registered Nurse under the USMCA, and describes the unit and duties in clinical terms. It should give the start date, the intended end date within three years, the salary, and a sentence confirming that the applicant holds the required licence. If the recruiter drafts a letter saying the position is contingent on licensure, ask for it to be reissued once the licence is granted, because a contingent offer invites the officer to ask whether employment really exists.
Hypothetical example: a Lake Country nurse is recruited through an agency that will place her at the hospital; the letter must then come from whichever entity will pay her and direct her work, with the placement contract available if asked. Bring transcripts and the degree even though the licence is the qualifying credential.