Although he debuted in the comics as a Flash villain and continues to antagonize the Scarlet Speedster periodically, Digger Harkness, a.k.a. Captain Boomerang, is arguably just as well known for being a member of the Suicide Squad, having been affiliated with the group since it was re-imagined in the 1980s. So naturally he was included in 2016’s Suicide Squad, played by Jai Courtney, and he’ll also be one of the few returning characters in the next cinematic appearance of the officially-designated Task Force X, The Suicide Squad.
Article source: https://www.cinemablend.com/news/2480460/jai-courtney-teases-captain-boomerangs-return-in-the-suicide-squad