Vietnam in 1967, and Project Stormfury, which, similar to the Typhoon Moderation Program, sought to weaken typhoons in the early 1960s. Kintanar detailed Weather Modification Experiments (WEMEX), such as WEMEX I, which was initiated over Central Visayas in 1975, and WEMEX II, which was initiated over Central Luzon the following year. Results were inconclusive, but as with both Popeye and Stormfury, the data gathered ultimately proved helpful for meteorologists in future tracking of weather patterns and typhoon forecast. Four organization units initially comprised PAGASA. The National Weather Service undertakes the preparation and subsequent prompt issuance of forecasts and warnings of weather and flood conditions. The National Atmospheric, Geophysical and Astronomical Data Service undertakes the acquisition, collection, quality control, processing, and archiving of atmospheric and allied data. The National Geophysical and Astronomical Service undertakes observations and studies of seismological and astronomical phenomena, as well as provides the official time for the country. The National Institute of Atmospheric, Geophysical and Astronomical Sciences is responsible for the training of scientists and technical personnel with respect to atmospheric, geophysical and astronomical sciences. Later on in 1977, the Typhoon Moderation Research and Development Office and the National Flood Forecasting Office were placed under administrative supervision of PAGASA, pursuant to Presidential Decree No. 1149, s. 1977. PAGASA saw a lot of accomplishments during the Marcos regime. In 1973, the Pampanga River Basin Flood Forecasting and Warning Project, a joint undertaking of the PAGASA and the Ministry of Public Works, Transportation and Communications, was inaugurated, and upon recommendations of a survey mission, the Japanese Government provided the equipment and training of personnel for the project. Early in 1974, PAGASA, in cooperation with the Office of Civil Defense, put up a radio station with callsign DZCA. Through a network of automatic stations situated at strategic points along the Pampanga River and its major tributaries, data on the rise and fall of the river levels are sent to the Flood Forecasting Center in the Central Office via existing telemetry system. Impressed with the success of the Flood Forecasting System in the Pampanga River Basin, President Marcos instructed PAGASA to explore the possibility of putting up a similar system in the Agno, Bicol and Cagayan River Basins. The UNESCO-sponsored Regional Seismological Network in Southeast Asia set up an office in the PAGASA Geophysical Observatory in 1974. It sought to standardize the training of personnel and seismological equipment, as well as