Good, they are perfect targets for heavily loaded B-1s and B-52s in those trenchs. A trench is no match for a 500 pound Mk-82 GP bomb, let alone 50-80 of them, and that's from just one airplane. (84 Mk 82s for B-1B, suprisingly only 51 for B-52H, although older models could carry more see FAS Site) Makes a nice linear target too, perfect for "carpet bombing".