An 18-year-old Australian army recruit has died in hospital on Tuesday after he was involved in an incident at the Kapooka training camp in the NSW Riverina region.

Liam Wolf was airlifted to a Sydney hospital for specialist treatment after he was injured on Good Friday during basic training at the Army Recruit Training Centre in Kapooka, the Department of Defence said in a statement on Tuesday.

"Recruit Liam Wolf was completing basic training at the Army Recruit Training Centre in Kapooka, New South Wales, when he was involved in an incident," the statement read.

"Due to privacy requirements, Defence will not be releasing any further information regarding the recruit’s personal or service details."

Australian Army

The Australian Defence Force said it was working with NSW Police and the national workers' compensation insurer Comcare to investigate the incident.

The ADF offered its condolences to Mr Wolf's family and friends and noted the "commendable" actions of the army members and health staff involved in giving him immediate first aid.

Tributes have been flowing for the teenager on Facebook.

"I'm lost for words, Our friendship over these many years I will cherish forever, RIP Love you bro," Maximilian Baumer posted on Tuesday.

"Taken too soon and it doesn't feel real, I'm gonna miss you bro," Ben Wiltshire posted.

"Rest in peace Liam Wolf. I remember so many funny memories from primary school as well as schoolies, you always had my back! You will be missed," Emi Nicole said on Facebook.