LEARNING FROM HISTORY57,000 more troops to Iraqhttp://news.yahoo.com/s/ap/20061117/ap_on_go_ca_st_pe/us_iraqMore than 3 1/2 years into the war, the Army and Marine Corps are straining to keep a steady flow of combat and support forces to Iraq while giving the troops sufficient time between deployments for rest and retraining.Both services are far short of their goal of providing two years between