CREATE TABLE table_16056 ("Camp" TEXT, "Estimated deaths" TEXT, "Operational" TEXT, "Occupied territory" TEXT, "Current country of location" TEXT, "Primary means for mass killings" TEXT)

what's the current country of location with operational period of summer of 1941 to 28 june 1944
SELECT "Current country of location" FROM table_16056 WHERE "Operational" = 'Summer of 1941 to 28 June 1944'
SELECT "Current country of location" FROM "table_16056" WHERE "Operational" = 'Summer of 1941 to 28 June 1944'