CREATE TABLE table_70418 ("Name" TEXT, "Born" TEXT, "Age at first step" TEXT, "Mission" TEXT, "Lunar EVA dates" TEXT, "Service" TEXT)

The astronaut who was 37y 8m 4d when making a first step on the moon was in which service?
SELECT "Service" FROM table_70418 WHERE "Age at first step" = '37y 8m 4d'
SELECT "Service" FROM "table_70418" WHERE "Age at first step" = '37y 8m 4d'