CREATE TABLE table_55319 ("Date" TEXT, "Opponent" TEXT, "Home/Away" TEXT, "Field" TEXT, "Result" TEXT)

Was the game against the Rattlers at the United Sports Training Center a home game or an away game?
SELECT "Home/Away" FROM table_55319 WHERE "Opponent" = 'rattlers' AND "Field" = 'united sports training center'
SELECT "Home/Away" FROM "table_55319" WHERE "Field" = 'united sports training center' AND "Opponent" = 'rattlers'