Aden is a seaport city in Yemen located in the Gulf of the same name by the Red Sea.
While the team leader was updating Fury, Iron Man attacked the freighter and the Ten Rings operatives inside, saving the S.H.I.E.L.D. operatives when they got surrounded. The team leader tried to question Stark, but he flew away before being able to do so.
Tony Stark returned to Yemen during his early quest of establishing world peace, using his newly created identity as Iron Man. Stark arrived at a ship on the Gulf of Aden under attack, and while J.A.R.V.I.S. was cross-checking the information with the International Maritime Bureau, Stark recognized the assailants' identity as Somali pirates. He engaged them in retaliation, defeating the group.