Consider the terrain - an FOB in rural Afghanistan is going to have access to a lot of dirt/sand/etc to fill the Hescos, while simultaneously not having restric

Consider the terrain - an FOB in rural Afghanistan is going to have access to a lot of dirt/sand/etc to fill the Hescos, while simultaneously not having restrictions on wall depth due to existing infrastructure. In a dense urban environment there isn't likely to be thousands of cubic feet of readily available fill material, and a 3-5 foot thick Hesco is going to be much more difficult to emplace than a 12" thick concrete barrier.