Ka kammala wannan magana: Daga Agusta 1929 zuwa Yuli 1931, an ba Hawley aikin binciken Canal na Nicaragua. Hukumar Canal Canal ta Amurka ta amince da aikin shekaru biyu don bincika hanyoyin da za a bi ta hanyar Nicaragua don haɗuwa da Atlantic da Pacific Oceans <unk> don zama mafi girma fiye da Canal Panama. Wani rukuni na injiniyoyi 320 da ma'aikatan tallafi da aka tsara a cikin rundunar injiniyoyi na wucin gadi - Hawley daga cikinsu - sun bincika hanyoyi da yawa a cikin ƙasar. A ƙarshe rahoton ƙarshe na binciken bai sami hanyar da ta dace da tashar ruwa a wancan lokacin ba. Bayan ya yi yaƙi da sauro mai ɗauke da zazzabin cizon sauro da kuma kusan cutar syphilis a cikin jama'ar yankin, Hawley ya fara aiki a lokacin Maris
Girgizar kasa ta 1931 a Nicaragua, inda shi da rukunin likitocinsa suka kafa yankin magani kuma suka ba da kulawa ga duk waɗanda suka gabatar da kansu, suna yin manyan ayyuka 10 da ƙananan ayyukan tiyata 20. Hawley da kansa ya kula da wadanda suka ji rauni daga girgizar kasa har tsawon sa'o'i 48. Don hidimarsa, yana ɗaya daga cikin jami'ai huɗu na rukunin da aka ba da lambar yabo ta Shugaban ƙasa ta Nicaragua. Daga cikin sauran jami'an uku da suka karbi lambar yabo sune kwamandan battalion, Lieutenant Colonel Daniel I. Sultan, babban jami'in battalion, Major Charles P. Gross, da kuma kwamandan kamfanin A, Lieutenant Leslie R. Groves. Daga baya, dukansu sun sami matsayi mai girma a Yaƙin Duniya na Biyu. An kuma ba wa membobin batalayon lambar yabo ta yakin Nicaragua ta biyu don hidimarsu a can. A lokacin da yake tafiya a Nicaragua cewa Hawley ya ci gaba da dangantaka da wasu jami'ai a kan Binciken da zai yi masa hidima a lokacin yakin duniya na biyu, lokacin da yawancin su suka dauki matsayi mai muhimmanci a cikin Turai Theater of Operations ko War Department a lokacin yakin.