active, ah-64, air, american, and, apache, art, aviation, battle, bell, black hawk, blue, boeing, book, ch- 47 chinook, ch-47 chinook, conditions, counter, dark, database, department, destruction, enemy ., fire, flight, force, freight, grey, helicopter, helicopters, hh-60, impact, in operation, intended, landing, live, longitudinal, los angeles, main, men, mh - 60k, mi- 28, mi- 8, mi-17, mi-24, mi-28n, mi-8, mi-8amt, mil, miles, military, multi-purpose, night, night hunter, night., of "berkut", of the blade, other, picture, purposes, russia, scheme ., search, shock, sikorsky, silhouettes, since the mid -1980s the, sky, soviet, soviet union, special forces, sunset, tanks, transport