The second unmanned launch, Apollo 6, also used LC-39A.

The program included 20 unmanned launches, followed by two suborbital and four orbital flights with astronaut pilots.

The modernization, funded to the tune of $2 billion is intended to improve the efficiency of both manned and unmanned launches.

There are other cases during unmanned launches in the 50s and 60s where the pogo effect caused catastrophic launch failures.

All four unmanned launches out of 12 planned tests ended in failure, each before first-stage separation.

The first unmanned launch will take place in 2015.

Various crew and modules were used over its lifetime, including a total of 12 manned and 15 unmanned launches.

The first unmanned launch was originally planned in April 1967, requiring delivery at the Cape around September 1966.

This region contains material left over from previous manned and unmanned launches that are a potential hazard to spacecraft.

SLS-2 became operational in 2003, and has since been used for most unmanned launches from Jiuquan.