Sentence:  He, and many others who had “<WSD>itchy trigger fingers</WSD>” and who wanted America to get in bed with war against communist Cuba and the Soviet Union, felt betrayed because JFK did not provide direct air power or support, leaving the right-winged exiles to be crushed by the Cuban army. 
Meaning of the word marked with <WSD> tags:  The trigger finger of a person eager to fire their weapon or likely to do so unexpectedly.