Pvt. Jonathan Sorensen, sapper with 2 Field Squadron Royal Engineers, from Christchurch, New Zealand, looks through his optic to identify hidden improvised explosive devices at combat hunter training during the initial stages of exercise Southern Katipo 2013 aboard Waiouru Military Camp, New Zealand, Nov. 9. SK13 allows service members to collaborate with partner countries to achieve mutual security goals, address shared concerns and continue to enhance our interoperability. - Pvt. Jonathan Sorensen, sapper with 2 Field Squadron Royal Engineers, from Christchurch, New Zealand, looks through his optic to identify hidden improvised explosive devices at combat hunter training during the initial stages of exercise Southern Katipo 2013 aboard Waiouru Military Camp, New Zealand, Nov. 9. SK13 allows service members to collaborate with partner countries to achieve mutual security goals, address shared concerns and continue to enhance our interoperability.