BOOZ ALLEN HAMILTON HOLDING CORP revenue for the last year amounted to 9.88 B EUR, the most of which — 4.69 B EUR — came from its highest performing source at the moment, Defense Clients, the year earlier bringing 3.88 B EUR. The greatest contribution to the revenue figure was made by United States — last year it brought BOOZ ALLEN HAMILTON HOLDING CORP 9.72 B EUR, and the year before that — 8.33 B EUR.