-In Veteran mode, your life expectancy is cut to three or four shots until you die. However, Veteran mode does not improve the enemy's aim or strategy. Use small blocks or small bulges of hills as cover and crawl. Since you do not get points for kills, do not take the Nazis head on. Let your allies lay some fire, if there are any. If not, toss a smoke grenade and shift between crouch and crawl positions, laying cover fire and stall some time for the smoke grenade to spread before the Nazis rush in. Use this smoke cover to fall back to the nearest safe position where you can regroup or hide and pick the Nazis off from afar.
-While playing on the Veteran difficulty in campaign mode, always take cover. Whenever you reload or get hurt pretty bad, always go prone or get behind a wall. Also, use your smoke grenades wisely. You will need them to get past certain parts of the game; for example, when clearing houses or getting past turrets.