Ключевые слова: air force, aircraft, america, american, armed, armed forces, army, aviation, background, celebration, concept, flight, force, forces, greeting card, helicopter, heroes, holiday, honor, independence, independence day, july 4, memorial, memorial day, military, national, november 9, patriot, patriotic, patriotism, protection, remember, security, service, silhouette, sky, sun, sunrise, sunset, transport, united states, usa, vehicle, veteran, veterans day, war, weapon,