A guest on Tom Woods' podcast, who worked in intelligence in the state department leading up to and during the Iraq war, mentioned she didn't think Trump's comments in South Carolina about Bush lying hurt him. To the contrary, she said that while current and former military show strong, patriotic faces in public, there is a lot of regret and resentment behind closed doors in families where soldiers were sent off to be permanently damaged or die on a fool's errand.
The data seems to validate her assertion. In eight states were exit polling has been conducted, Trump has done better with current and former military than he has done with civilians in all but one of them. His support in each state among those who are current or former military and those who aren't:
Trump is the least bellicose of the remaining Republican presidential candidates, especially towards other states--to my knowledge he hasn't even hinted at military action against any other country, only the obligatory pledge to destroy ISIS--and veteran affairs make a fairly regular appearance in his stump speeches.
Turns out America's warriors aren't gunning for a guy like Kasich to send them against Russia if the bear does something the US government deems unacceptable to Finland. Good for them.