troop transport chinook helicopter flies through gray cloudy skies

aerodynamics air airborne armed atmosphere aviation base boeing ch47 chinook chinooks clouds cloudy confidence cumulus dangling descends descent disaster division double drop drops dual equipment flight flights fluffy forces gear gravitational gravity gray helicopter historical history humanitarian invade invasion isolated maneuver maneuvers military operation operations parachutes paratrooper piloting plummets practice relief rotor rotorcraft security service services single skies skill slows soldier soldiers solitary sortie sorties stationary strategy tactics tandem training transport troop troops troposphere