Tuhia he tomokanga mo tenei waahanga - Ko nga tohu rererangi hoia tuatahi o te United States kei roto i te whetu i whakamahia e te US Army Signal Corps Aviation Section, i kitea i te wa o te haerenga whiu a Pancho Villa
, neke atu i te kotahi tau i mua i te tīmatanga o te whakauru o Amerika ki te Pakanga Tuatahi o te Ao. I peitahia te whetu i runga noa i te hiku poutū, i roto i te whero (te tae e whakamahia ana i te nuinga o te waa) he puru ranei (he iti ake pea, na te kaha o te whakaahua orthochromatic o taua waa, e whakaatu ana i te whetu whero hei pango i nga whakaahua o te waa). I taua wā anō, i whakamahia e te US Navy tētahi punga puru i runga i ngā rumu o ōna waka rererangi.