"While Mitchell didn't get the opportunity to deploy, he was awarded the NZ Defence Service Medal in 2018."
"His mates have described Mitchell as a bright, fit and professional soldier who lived to work hard - play hard. He was a good mate to all and a keen motorcycle enthusiast."
Boswell said it was "incredibly sad" to lose the young soldier.
"I know his family, his partner, his mates and his unit will be deeply affected by Mitchell's passing, and the thoughts of us all are with them at this difficult time."
It was the third fatal motorcycle crash in the South Island over the weekend, following accidents in Timaru and Nelson on Saturday.
Tributes to Aaron Sadler have been posted on a givealittle page to help with funeral costs.
"Aaron, you will be dearly missed, especially that cheeky grin of yours."
"Fly high brother, rest in peace."
A picture of a motorcycle appears on Aaron Sadler's givealittle page. Photo / Supplied.
Police said at the time the accident involved two motorcycles, but it was unknown whether the two men were riding together.
The crash happened between the Sign of the Kiwi Cafe and the Sign of the Takahe.
The investigation is ongoing, a Police spokesperson said.
