What are the modern equivalents of the LCI and LSM?
Short answerTrue LSMs are uncommon and smaller LPDs fill much of that role, while infantry delivery continues through craft such as British LCVPs and their equivalents.
NotesFew contemporary ships are true successors to the Second World War landing ship medium because smaller LPDs occupy much of that range. The infantry-delivery function remains visible in smaller craft, including the LCVP label used in British service and equivalent boats in other navies. The missions have survived even where the old labels have faded. Modern hulls do not need to preserve a one-for-one historical ship type to perform the same task.