SERVICE PROJECT NUMBERS 



The Committee on Propagation did all of its work imder 

 Project Control SOS-9, which was originally set up through 

 the request of the Combined Chiefs of Staff following recom- 

 mendations submitted by the Combined Meteorological Com- 

 mittee: 



1. That the Committee on Propagation of the National 

 Defense Research Committee be requested to act as a co- 

 ordinating agency for all meteorological information associated 

 with short wave propagation; 



2. That the Committee on Propagation be requested to 

 forward periodically to the CMC a list of all reports and 

 papers dealing with the meteorological aspects on short wave 

 propagation which have been received or transmitted by 

 that Committee. 



Later the Combined Meteorological Committee in its 37th 

 meeting on Tuesday, February 22, 1944, agreed that the 

 National Defense Research Committee (NDRC) Committee 

 on Propagation be recognized as the supervising committee on 

 all basic research being done in the United States on the 

 related i)roblems of radar propagation and weather, in addi- 

 tion it shall be the recognized channel whereby international 

 exchange of papers of the two related sciences will be eiTected. 



The Joint Communications Board therefore approved the 

 follo«ing i)olicy, which was concurred in b_y NDRC and by 

 the Joint Meteorological Committee: 



1. The NDRC Propagation Committee and its associated 

 working groups will initiate and exercise technical supervision 

 over such tests and investigations as they deem necessary to 

 ascertain the nature of the above-mentioned propagation 

 anomalies in the VHP, UHF, and SHF bands, to devise the 

 most practicable methods to determine the occurrence and 

 characteristics of these anomalies from ajiijropriate meteoro- 



logical forecasts, with a view to improving the interim solutions 

 offered by the Joint Wave Propagation Committee of the JCB. 



2. The Army and Navy will furnish by direct coordination 

 between them the basic staff guidance for such tests and 

 in\'estigations. They will accomplish this by determining: 



a. The specific forms in which basic prediction data 

 shall be presented, and 



b. The method of use required for operational forecast 

 of proiiagation anomalies in the VHP, I'HF, and SHF bands. 



3. When the NDRC requires the cooperation of the operat- 

 ing units of the .\rmy and Navy in conducting such tests and 

 investigations as it deems necessary and this cooperation is 

 of such an extent and nature that it cannot be furnished bj^ 

 informal coordination, it will be requested through the Joint 

 Wave Propagation Committee of the JCB. Such requests will 

 be initiated bj' the NDRC representative on the Wave Propa- 

 gation Committee and recommended to the Joint Communica- 

 tions Board by the Joint Wave Propagation Committee for 

 consideration. 



4. The Joint Wave Pro]5agation Committee will be respon- 

 sible for devising and furnishing inmiediately, interim opera- 

 tional forecasting guides based upon information already 

 available. 



(^n A]iril 3, tlie Coordinator of Research and Development 

 requested that the Army Project SOS-9 be made a joint .4rmy- 

 Navy project. Project No. AN-16 was assigned to this. 



On May 23, 1944, the Chief Signal Officer requested that 

 under Project AN-16 the following work be inaugurated: 



Project AC 230.04 "Wave Propagation Study of Line- 

 of-Sight Communication and Navigation." 



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