Four years and 50,000 troops into President Felipe Calderon's drug prohibition war, the fighting has exposed severe limitations in the Mexican army's ability to wage unconventional warfare, tarnished its proud reputation and left the U.S. pointedly criticizing the force as "virtually blind" on the ground. A series of secret diplomatic cables leaked recently revealed the United States' profound unease over Mexico's efforts, despite public assurances to the contrary, with stinging language criticizing the army as stymied by well-protected fugitive drug lords. U.S. diplomats and Mexican intelligence officials say the Mexican military and police distrust each other, refuse to share intelligence and resist operating together, squandering important potential gains.