Melphy was named to the team in February 2018 where he made his debut in the 2018 USA Sevens in Las Vegas.

Melphy played Varsity Soccer at Heritage High School under coach Adam Buseck.

Melphy attended Division II school Metropolitan State University of Denver from 2010 to 2011 under Ken Parsons.

[2] After high school he joined the Glendale Raptors men's rugby club where he played for the PRP from 2012 to 2015 under Andre Snyman.

Melphy played collegiate rugby at Life University under Scott Lawrence from 2015 to 2017 where he studied Health Coaching and Business Management.

Melphy became a part of the US Army World Class Athlete Program upon graduation from Delta co. 31st Engineer Battalion, his One Station Unit Training on February 9.