Following that announcement, the Squad returned only once in Season 3 with Deadshot and Cupid working with John Diggle and Lyla Michaels, and the team hasn’t been seen again since.
After its members and leadership appeared in earlier episodes, Arrow’s Suicide Squad officially formed in the aptly-named episode “Suicide Squad” in March 2014.
Seven months later, DC announced its initial slate of DC Extended Universe movies, with Suicide Squad being among them.
Oh well, we should be thankful for what little time we shared with them, right?