p1 action ["EJECT",c130]
p1 is your player name, c130 your c130's name
will do the trick nicely. however if your doing this to several units at the same time, a delay of at least 0.5s (depending on speed) is best to stop them crashing into each other.
hope that helps
*edit* or alternatively a way for a group is
"_x action ["EJECT",c130]" foreach units group1
but this wont put much of a delay between each guy leaving.