The scene kicks off with Deadshot, Diablo, Boomerang, Slipknot, Harley Quinn, and Killer Croc on board a Chinook helicopter, joined by a small cadre of Navy SEALs. Both they and Task Force X are led by Rick Flag, but it's then that someone else joins them; Katana. The twist here however is that she's actually a volunteer, and Flag's bodyguard! Here's the dialogue from the sequence:
"She's got my back," Flag informs the Squad. "I'd advise not getting killed by her - her sword traps the souls of its victims." Harley extends her hand, perky and smirky. "Harley Quinn, nice to meetcha. Love your perfume. What is that: Stench of Death?"