Which rank is typically held until a Royal Marine finishes training?

The rank typically held until a Royal Marine finishes training is Second Lieutenant. Upon successfully completing their training, Royal Marines are commissioned into the Officer Corps starting at this rank. The role of a Second Lieutenant involves taking on initial leadership responsibilities and being closely monitored as they transition from training to active service.

This rank signifies the beginning of an officer's career within the Royal Marines, allowing them to gain practical experience and develop their skills as leaders. The decision to use Second Lieutenant as the training rank ensures that new officers can effectively learn and apply their military knowledge under the guidance of more experienced officers.

Other options like Lieutenant, Corporal, and Major represent ranks that are either higher or signify different stages of a military career that are not typically held by newly commissioned officers right after training.