I think what it may come down to again was just how much transport did the units still in the U.S. have? By the time of the Mexican invasion the U.S. was already running low on gasoline and the transport network had taken a huge hit. So while maybe in a normal situation they would be flush with anti armor weapons and ammo here the units at the border showed up not that well equipped at all - maybe just men and small arms and a few support weapons but without much of the anti armor and other heavy support weapons they normally would have. Again the huge drain of equipment to Europe and Asia to keep the units there somewhat in the fight after the massive losses of 1997 could be the culprit. "Sarge why only one grenade a piece?" "Why are you gonna need grenades private, it's not like we are gonna fight a war against Mexico?" says the sergeant, not knowing the next morning that he would be fighting for his life against enemy armor crossing the Rio Grande.
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