I'm going to nit this for several reasons: 1. Walking on the moon implied a return trip which requires an extra ~3km/s. 2. Under the rocket equation the fuel

I'm going to nit this for several reasons: 1. Walking on the moon implied a return trip which requires an extra ~3km/s. 2. Under the rocket equation the fuel requirements for more delta v grows superlinearly, which then awkwardly makes your rocket bigger, which requires more fuel... 3. 22 years prior a metal can went to space. The scale of a manned moon mission in comparison is absolutely nuts, even basic things like having rocket motors that can be relit is a large technical challenge.