BTW, this mission will also set a record for lowest cost per pound of cargo to LEO. The COTS contract with SpaceX is, if I recall, $1.6 billion for 12 missions, or $133 million per launch. They're delivering 1,000 pounds of cargo and then returning 2,000 pounds of cargo, for a net delivered to LEO of -1000 pounds.
Whereas NASA was struggling to break the +$5,000 per pound barrier, SpaceX just broke the negative
$133,000 a pound barrier. Yes, that's less than nothing!