CREATE TABLE table_204_608 (id DECIMAL, "name" TEXT, "elected party" TEXT, "constituency" TEXT, "elected date" TEXT, "military service" TEXT)

how long did bernard pilon serve in the canadian army ?
SELECT "military service" - "military service" FROM table_204_608 WHERE "name" = 'bernard pilon'
SELECT "military service" - "military service" FROM "table_204_608" WHERE "name" = 'bernard pilon'