The article made several mentions of requiring additional trained crew. Where is the gap in getting staff? I expect there is a tiny fraction of specialists (eng

The article made several mentions of requiring additional trained crew. Where is the gap in getting staff? I expect there is a tiny fraction of specialists (engineers, medical, ship command) and a boat load of low skill jobs (cooks, cleaning, waiters, pool boys, bar tenders, etc) who could do on the job training if required.