CREATE TABLE table_17665 ("Year" FLOAT, "Division" FLOAT, "League" TEXT, "Regular Season" TEXT, "Playoffs" TEXT, "Open Cup" TEXT)

What is the latest year that 6th, Heartland is regular season?
SELECT MAX("Year") FROM table_17665 WHERE "Regular Season" = '6th, Heartland'
SELECT MAX("Year") FROM "table_17665" WHERE "Regular Season" = '6th, Heartland'