As part of this program, William Anders took a photo that Galen Rowell called "the most influential environmental photograph ever taken."
As part of this program, William Anders took a photo that Galen Rowell called "the most influential environmental photograph ever taken." An early failure of this initiative occurred when a 100% oxygen environment caused a fire during a routine systems test to burn out of control. A speech supporting this program noted that undertakings like it were done "not because they are easy, but because they are hard." On July 20, 1969, this program landed the Eagle on the Sea of Tranquility, prompting the quotation "That's one small step for man, one giant leap for mankind" from Neil Armstrong. For 10 points, name this NASA program that successfully landed humans on the moon. 
As part of this program, William Anders took a photo that Galen Rowell called "the most influential environmental photograph ever taken."
Apollo program [or Project Apollo; accept Apollo 8; accept Apollo 1; accept Apollo 11; prompt on landing on the moon]