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The engineers at Grumman went to extraordinary lengths to trim weight from the Lunar Module so that its single ascent engine could boost it from the lunar surface. The book Moon Lander by chief engineer Thomas J. Kelly tells the story.

The flag was extended by a wire along the top.

Think. Rocket launching from the Earth had to bring EVERYTHING up, had to fight six times greater gravity and atmosphere. Now do the calculations.

No, there is no wind on the Moon cause there is no air. So? Take a rope and swing one end of it. You will see a nice wave going on. You can have waves without the wind.

The gravitational pull on the moon is 6 times less than on Earth so it requires a lot less energy to lift off.