"When I got home I went straight back to the army hall here in Tauranga and learnt all about being a reservist. I marched out in January this year and have not looked back – it fits in perfectly right now while my son is young because the reserves are all about family first."
Sandison said the biggest thing for her was showing people "that anyone can do it".
"Only two years ago, when I made the decision to apply for the army, I was almost 100 kilograms. I put my head down, sorted my diet, and got training, and when I marched out of basic training at 30 years old, a single mum, I had lost 30 kilograms.
"And now here I am. In just eight months I have already done so much. In one exercise we covered 30 kilometres over 32 hours with no sleep, and in another exercise, on Rangitoto Island, we covered more than 50 kilometres over about the same time while learning leadership skills under fatigue and sleep deprivation."
Sandison said the skills, friendships, and opportunities she had gained as a reservist were beyond anything she could have imagined.
"It is just so satisfying. I am able to integrate the skills learnt in both my personal and professional life – it really is priceless."
When Sandison returns from Malaysia she will start a new role, as a tutor for 16 to 19-year-olds at the Advance Training Centre Military Prep School in Hamilton.
Exercise Bersama Lima is usually based in Singapore and takes place in the South China Sea and around the Malaysian Peninsular. It involves Royal New Zealand Navy, New Zealand Army, and Royal New Zealand Air Force units and supporting units conducting training with Five Power Defence Arrangement air, land and maritime assets.
Members of the New Zealand Army Reserve regularly work and train alongside their regular force counterparts in New Zealand and overseas. Their military training also strengthens the leadership, resilience, teamwork and focus they bring to their civilian roles – benefitting their employers and their communities.