Adolf Kaien is a Major in the Papua New Guinea Defence Force and Operations Officer for the 2nd Royal Pacific Islands Regiment based at Moem Barracks in Wewak. He joined the PNGDF in 2003 and was commissioned as an officer in 2006. His extensive defence career has included deployment as a platoon commander to Solomon Islands as part of RAMSI (2009), officer instructor and infantry instructor, before his most recent appointment to 2RPIR in 2016.