Bangladesh Navy-which one does NOT belong?

This one is for you, Rob. These are some photos I took recently on a boat trip from the port city of Khulna, Bangladesh all the way south to the Mangrove forest of the Sundarbans. We hiked to the beach and some folks even swam in the Bay of Bengal. These ships were located in the port of Mongla (sp?) apparently the 2nd largest port in Bangladesh after Chittagong. I thought you would appreciate the Naval ships from this part of the world. Hopefully you can pick out which one does not belong?!