Table:
text: 2007 Rugby World Cup squads
Pool A
United States
Player Position_ Date_of_Birth_Age Caps Club_province
Valenese Malifa Fly-half 10 September 1985 3 Belmont Shore
Philip Eloff Centre 17 September 1978 32 Chicago Lions
Paul Emerick Centre 24 January 1980 24 Newport Gwent Dragons
Vahafolau Esikia Centre 28 November 1979 7 San Mateo
Albert Tuipulotu Centre 27 February 1979 16 San Mateo
Takudzwa Ngwenya Wing 22 July 1985 0 Biarritz
Thretton Palamo Wing 22 September 1988 0 San Francisco
Salesi Sika Wing 6 July 1980 13 Béziers
Francois Viljoen Fullback 16 May 1981 18 Belmont Shore
Chris Wyles Fullback 12 February 1983 3 Belmont Shore

Question: What position does the player with 13 caps play in the Rugby World Cup Squads 2007 United States team?