During a Captain America storyline, the super soldier serum running through Steve Rogers' veins was neutralised rendering the WWII hero an old man. Sam Wilson picks up the shield and takes on the mantle maintaining his wings in the process. Sam was a member of the Mighty_Avengers_Vol. 2 under Luke Cage's leadership. If the title of this comic is to be believed, it would appear that "Falcon" is taking over this branch of the Avengers.