Because of your post, I went ahead and read the article. These people are nuts! On the one hand, they should be compensated for not being able to use their land, or maybe the purchase price reflected compensation.
On the other hand, they knew they couldn’t live in the home, and yet blame the Army for keeping them out. Let me guess ....they’re Dimocrats??
The easement existed at the time they purchased the land. The former owners of record in 1955 had been "compensated" for the value of the easement at that time.
They were "compensated" by the reduced sale price of the land that resulted from such a easement.
When you buy property with an easement, you buy it "as is". The purchase price reflects that.
If, on the other hand, the realtor did not disclose the easement or did a sloppy title search, then they can sue the realtor for fraud or negligence.
The Army has no liability in this. They have had their easement rights for decades, maybe since before these people were even born.