Bahasa Jepangnya “calon anggota”

pasukan cadangan; calon anggota; tentara cadangan; orang yang berisiko

reserves (esp. troops); potential members of some group (e.g. the elderly); reserve army; people at risk (e.g. of a medical condition)

pelatihan dasar calon anggota Pasukan Bela Diri Jepang

boot camp for new recruits (conducted by Japan's Self-Defence Force)