Pedzisa mutsara unotevera: Zvichitevera kurwiswa kweJapan kuPearl Harbor uye kupinda kweUnited States muHondo Yenyika II, Wickersham akasimudzirwa pachigaro chenguva pfupi cheBrigadier general muna Ndira 1942 uye akatora basa saMukuru weChikoro cheHurumende yeMasoja ichangobva kuumbwa iri paYunivhesiti yeVirginia muCharlottesville, Virginia. Paaive pachinzvimbo ichi, aive pasi peProvost Marshal General weMasoja, Major general Allen W. Gullion uye aive nebasa rekudzidzisa maofficial mune ramangwana zvakadzama zvine chekuita neHurumende yeMasoja uye Liaison. Vakapedza kudzidza vakabetsera vatungamiriri vari muminda yokumwe muukama hwavo navanhuwo zvavo. Paakanga ari mubasa iroro, Wickersham aivawo nebasa chairo somupi wezano wezvinhu zvehurumende yechiuto mu
Africa, Sicily, uye Italy. Nokuda kwebasa rake mubasa iroro, Wickersham akagamuchira menduru yeLegion of Merit.