Circa 1997, I was in Panama, on the Caribbean side, getting my boat ready to transit the canal to the Pacific. I was walking from Colon's old so-called yacht club (now long gone) through an industrial port area to get to Colon City. When I was passing about 20 fallow acres, I witnessed a training exercise by a dozen or so off-road motorbikes in green paint, each with a pair of uniformed soldiers on them. The soldiers riding on the back each carried a carbine. While I watched from a few hundred yards away, they did a "reverse starburst," that...