Question: what's the current country of location with operational period  of summer of 1941 to 28 june 1944
Schema: create table table_10335_1 (current_country_of_location varchar, operational varchar, PRIMARY KEY (current_country_of_location))
SQL: select current_country_of_location from table_10335_1 where operational = "summer of 1941 to 28 june 1944"