If DTaP #4 is given with at least a 4-month interval after DTaP #3, it does not need to be repeated. The minimum age of 12 months for the fourth dose must be met. Decreasing the interval to less than 6 months, however, is not recommended.
The total given by the VA for the Indian Wars (1,000) seems to be a wild guess. Just two major defeats -- Custer's and St. Clair's -- add up to about 900 dead all by themselves. The official number of Americans killed in the Revolutionary War (4,435) is only about 2/3 the numbers usually given by historians. The total of US combat deaths during the Civil War is given as 140,414 -- or some 30,000 higher than most historians would estimate. I suspect (but don't know for sure) that the boost may come from the DoD counting deaths among POWs as combat rather than disease.
Over the battle, 70% of France's Army was rotated through the area, whereas only 25% of the German Army saw fighting at Verdun. French losses were estimated at 161,000 dead, 101,000 missing, and 216,000 wounded. German losses were estimated at 142,000 killed and 187,000 wounded. About 75% of the casualties were believed to be from artillery fire. During the first 5 months of the battle, the French used 15 million artillery rounds and the Germans fired an estimated 21 million artillery rounds over the length of the battle.