CREATE TABLE table_15939 ("UN Operation name" CLOB, "UN Operation title" CLOB, "Location" CLOB, "Dates of Australian involvement" CLOB, "Number of Australians involved" CLOB, "Australian role" CLOB)

When was it where 65 Australians were involved in the UN?
SELECT "Dates of Australian involvement" FROM table_15939 WHERE "Number of Australians involved" = '65'
SELECT "Dates of Australian involvement" FROM "table_15939" WHERE "Number of Australians involved" = '65'