South Korea's foreign ministry has selected about 750 people as personal assistants for the upcoming nuclear security summit in Seoul, which aims to bolster global safeguards and prevent nuclear terrorism, officials said Thursday. A total of 748 assistants will be tasked with providing services in the fields of transportation, registration of participants and media support during the Nuclear Security Summit on March 26-27, the ministry said in a statement. The upcoming summit will be the second since U.S. President Barack Obama launched the summit in Washington in 2010, South Korea''s News Agency (Yonhap) reported. The forthcoming summit is the largest international summit hosted by South Korea with top leaders from more than 50 nations and international organizations expected to participate. The assistants will receive training in their designated fields of service, which include conference management, protocol, interpretation and media center management, officials said. Seoul officials said one of the key topics at the Seoul summit would be how to protect vulnerable radioactive materials worldwide so terrorists could not use them to make a crude nuclear bomb.