Sorry guys, I was unable to make it due to problems.
As for the Allen M. Sumners the service dates I have from Harpoon 4 Master Annex A: Ships of the World 1960- Present (2003) are:
United States: 1943-1975, 53 in class, 33 were converted to FRAM II with 20 uncoverted
Argentina: 1972-85 (Hipolito Bouchard nee Borie and Piedrabuena nee Collett) FRAM II, 1976-83 (Segui nee Hank)
Brazil: 1973-95 (3 in service including the Sergipe) FRAM II, 1972-90 (1 in service)
Chile: 1974 - xx (2 in service) FRAM II
Colombia: 1972 - 1986 (2 in service) FRAM II
Greece: 1943 - 75 (???, may be typo since data is exactly the same as USA stats, didn't find changes in errata)
Iran: 1974 - 1994 (2 in class, Babr and Palang)
Korea: 1973 (2 in class including the Dae Gu)
Taiwan: 1974 (Wu Chin mod 2 - Lo Yang and Nan Yang) FRAM II, 1970 (Wu Chin mod 3 - Huei Yang), 1969 (Tien Shi - Hen Yang, Hua Yang, and Yuen Yang)