upside down flags symbolise a nation is crisis. Like after a devastating hurricane.
Only the flag patches affixed to right shoulders of uniforms are reversed, so the blue field of stars faces forward. (Left shoulder patches aren't a problem, as the stars face forward without meddling.) The reversal was inspired by the age-old practice of carrying flags into battle. When fastened to a standard, the American flag's blue-and-white portion is always closest to the pole. A flag bearer rushing into the fray, then, would naturally lead with the stars. In fact, it would be virtually impossible to lead with the stripes—the flag would simply wilt and wrap around the pole, rather than waving triumphantly in the wind.