Major Nicola Martin, of the New Zealand Army health promotion team, takes mid-upper arm circumferences as part of a child growth development assessment in Vaentali Medical Centre, Rovo bay, Vanuatu. ..Exercise Tropic Major aims to give NZDF personnel practice operating in a joint task.force in a tropical environment to provide regional security and humanitarian aid,.while providing training to members of the Vanuatu Police Force. The fictitious.scenario involves a breakdown of law and order on Epi Island, prompting the.Government of Vanuatu to request help to re-establish the rule of law and stability for.its citizens.