What's the joke about Commander mongolia navy?

Once in Degang Guo's cross talk, there was a joke about "Commander mongolia navy", saying that he would take office as soon as he found the sea. Hearing this, I laughed my head off. But it turns out that we are a little ignorant. In fact, as a landlocked country, Mongolia really has a navy. In fact, not only Mongolia, but also other landlocked countries have at least 16 naval establishments.