A poster on the donald, reddit, posted this comment regarding Chinese subs his friend saw. He was called out how he knew they were Chinese and he responded with this:

"He said he saw Chinese stuff on the side of the sub. I forgot if it was flags or letters. Maybe both. He also said his parents (who were immigration officers) told him they were coming from China. They had a bunch of young boys on them, apparently."

You were on a trail of this sort at one point and this seemed to substantiate your query.

I only lurk so I do hope I gave done this correctly and that it is if some help.

This is the reddit thread: https://www.reddit.com/r/The_Donald/comments/5un94b/fbiinsider4chanfeb16transcript/