In southeastern Colorado, robots carefully disarm WWII-era chemical weapons
arstechnica.com
arstechnica.com
I mean, in many cases most of that "huge expense" is going to be salary for the people that manufacture and then dispose of these arms. Of course, that puts the automation of such disposal in an interesting light: the robots are taking our jobs! Admittedly, as in most cases of "robots taking our jobs", these aren't really the sorts of jobs that most people would want to do anyway, but it does change the economic calculus of the whole military-industrial complex.
I was amazed at the simple engineering put into them, the spacing was perfect, they had been buried, but like a pill, a line had been cut into them with a door, to prevent the blast going through the door unprotected.
I later found out that I had driven past the Hawthorne Army Depot, which has one of the largest reserves of ammunition in the world. Very neat and strange. Something I would expect out of Nevada.