They are now back together.
Cook's lawyer, Roger Crowley, said Waiouru was a small town where gossip spread like wildfire. "One would need to be careful to protect one's reputation ... It would be important for you to ensure that [her ex-partner] didn't find out what you got up to," Mr Crowley said.
His cross-examination of the complainant focused on her lack of resistance to anything that was done, as well as the amount of alcohol drunk during the night and that the complainant's memory of some things during the night was inaccurate.
"You weren't forced to do anything in the Unimog violently or roughly or firmly," he said.
"Your actions in complying with what you thought was going on without any force or roughness could well have led these men to believe you were consenting."
The complainant disagreed, saying "not when you're saying no and saying you want to go".
Mr Crowley questioned why the complainant, despite finding the men "creepy", continued to walk with them into an unpopulated area of the camp instead of going back, using her cellphone, calling for help, or running away.
He said the complainant got into the Unimog of her own volition, to which she agreed.
However, she said it was fear that kept her from doing anything. "There's two guys in front of you, you're scared, you don't know what they're going to do if you try and stop them, if you try and get away. It doesn't matter if they're not violent," she said.
"How am I to know it's not going to get violent if I did try to fight back?"
Mr Crowley said there was no hint of force or violence at any point of the night, though the complainant maintained she had continuously said no and that she wanted to go home.
"I put it to you that you knew exactly what was going on. Had a big night out, plenty to drink. Walking with these guys, everything's good, they're kissing. There's holding hands. You jump in on your own volition, sexual contact takes place. It stops, you sober up and regret it like thousands of people have done in the past.
"You're worried about the rumour mill in Waiouru. You're worried about it spreading like wildfire that you had a threesome in a Unimog with two soldiers. You're worried about it getting back to [your ex-partner]. What's the best way to quash that? By saying 'I didn't consent'."
Crown prosecutor Megan Jaquiery asked the complainant why she called her ex-partner before her mother or sister.
"We had been together for a while, we'd been through bad stuff together," the complainant replied. "At the time I just felt comfortable calling him."
She said she didn't want to call her mother and wake her at that time of night and didn't want her father finding out and trying to "fix it himself".
The trial will continue until tomorrow or Friday.
