The Flag is still on the Moon which were placed on the moon by the Apollo missions.
Although the American Flag from Apollo 11 was likely knocked over by the ascent module's exhaust.
The American flags are likely faded as a result of solar radiation, although they still remain standing as images from the Lunar Reconnassance Orbiter confirm the presence of the American flags at the landing sites of the Moon.
While astronauts have walked on the moon, no astronaut has walked on the moon twice.
Each astronaut that has landed on the moon and walked on the moon only walked on the moon just once.
Several astronauts have traveled to the moon more than once, although only one of the trips to the moon, actually involved landing on and walking on the surface of the moon.
Jim Lovel flew to the moon twice, which was once on the Apollo 8 where he orbited but didn't land and once again on Apollo 13 which he orbited but also didn't land on the moon due to a malfunction.
Astronauts John Young and Gene Cernan also flew to the moon twice, but they only walked on the surface of hte moon during their second mission to the moon.
And the other 9 moonwalkers each only made one trip to the lunar surface.
Jim Lovell, David Scott, and Eugene Cernan (e: and John Young, oops) all went to the moon twice though none of them landed on it more than once.
Humans have walked on the moon a total of 6 times, with a total of 12 astronauts participating in the moon landings.
All of these missions were part of NASA's Apollo program between 1969 and 1972.
Human Moon landings require more resources than robotic landings, because humans require, oxygen, water, food and other amenities to remain alive.
So any country or agency which chooses to land people on the Moon will also have to accept a certain amount of risk and budgetary commitment.