The claim: This "closed" military base is adjacent to a state fish & wildlife preserve. Part of the base is converted to an industrial park, but the southern portion of this property is still used. It is bordered on the south by railroad, and is staffed with some foreign-speaking UN troops. A local police officer who was hunting and camping close to the base in the game preserve was accosted, roughed up, and warned by the English-speaking unit commander to stay away from the area. It was suggested to the officer that the welfare of his family would depend on his "silence". Located just southeast of LaPorte.
What it really is: First, there wasn't a military base there, just an ordinance plant there, and it closed down after the Korean War.
There really isn't that much there, as the town has a population of less than 250 people. The only thing around there that might be mistaken for a FEMA camp is some large warehouses south east of the town.
As for the claim of the police officer encounter UN troops, this story appears to be made up. I can not find any information to confirm this actually happen, and apparently no one else has claimed to have been accosted.