Page "BASE jumping" Paragraph 2

BASE numbers are awarded to those who have made at least one jump from each of the four categories ( buildings, antennas, spans and earth ).

When Phil Smith and Phil Mayfield jumped together from a Houston skyscraper on 18 January 1981, they became the first to attain the exclusive BASE numbers ( BASE # 1 and # 2, respectively ), having already jumped from an antenna, spans, and earthen objects.

Jean and Carl Boenish qualified for BASE numbers 3 and 4 soon after.

A separate " award " was soon enacted for Night BASE jumping when Mayfield completed each category at night, becoming Night BASE # 1, with Smith qualifying a few weeks later.