You’ve helped the Red Veil in the past, now we want to return the favor. Our spies have discovered a large batch of Corpus Arctic Eximus are massing for training around the polar region of Mars. With so many Arctic Eximus gathered in one place, you have the perfect opportunity to strike a crippling blow against the Corpus field command.
Go to Mars and take out as many of the Arctic Eximus as possible. We will offer you what we can from the spoils.
This Warframe Event is probably just to keep the players entertained while there has not been much new contents. This justifies the event for only rewarding the player a 3-Day Affinity Booster upon defeating an certain amount of Arctic Eximus (100) on Mars.