nah perienced in the field of atomic medicine having been participarts in pre= vicas testing using biological caterial as well as having had fall time research projects along this line during interim periods. This allows for proper evaloation of human effects toward correlaticn with cata on animals from which a great deal of our ideas on bucan effects have been extrapola- ted. Purther, they constituted an augmentation medical group for treatment "if necessary in conjunction with station medical facilities. An additional acventage was that almost all of the personnel had worked together as a unit oc previous occasions. 8. Hcne of the natives nor the Rongerik Americans had prelfainary or early systeric aymrtoms consistent with radiation sickness from large dosage of external whole body irradiation. A reported case of vomiting and a few cases of loss of appetite were no significant considering the sudden change in environment end diet to which they were subjected. fo relieve the load on the station medicalfacilities, not knowing of the early ar Faval of the medical group, the twenty eight Americans were returned to Enivetok to remain as octpatierts under the supervision of the Surgeon, Tasx Group 7.2. Hlood counts were taken at approximately three day intervals. They remained asymptomatic although there began a depression of the white blood cells of mild degree. They were returned to Kwajalein on 17 March. During the early days of March all patients remained free of sye~ -tecie symztoms attibutable to irradiation but there was a definite decrease in the white Ebed cell coumt more rarked in the Rongelap group. The blood pictures of the Ailirginae natives anc the Rongerik Americans were quite similar which was reasonable considering they were exposed to the same order of magnitude of radiation. The Utirik group showed nothing particular frem a medical standpoint and were considered as a virtually mormal native population for cempariscn purposes pending time for ob= taining base line data from non irradiated natives. By the thirteenth and fourteexth day a tendency to epilate had become evident in the Rongelap natives involving mostly children but within a few days it bad arpeared in adults. The epilation was both patchy and diffuse, confined mostly to the head and particularly in children the scalp assumed a spotty appearance due to depigmentation of the skin. — C a ur By ue a ck. ox A systematic organization was set up with a view toward mn enw * i Project hol. ning a aick call, performing blood studies, taking histories, making physical examinetions amd documenting the cases by means of records and photo= grephy. PBnaildings were furnished for these purposes by COMNAVSTAKKAJ and his Staticn Surgecn, Commander W. J. Hall, worked closely with the group. The establishzent of the investigating group of Project 4.1 was essential and desirable from several standpoints. All the zedical personnel were ex~ ee 1B om de § rwew Drs. G. V. Leroy and C. L. Dunham represented the Division of Biolegy and Medicine, AEC, and were to act as advisors to gy Project 4.1, 70 13 of Task Group 7.1 with Comzancer EB, P. Cronkite, K, USH, as Project Officer. eer ane Or \ the 0. S. Rawal Radiological Defense Laboratory and was established as ant wear a mate recone GA It consisted ee Ne The medical group arrived in Kwajalein om & March. sents sb ney Pete. WO!hk Me. wh 7e of military and civilian medical officers and technicians from the Naval Medical Research Institute, the Armed Forces Special Weapons Project and