Tarzian finished her freshman season at Georgetown as the Hoyas' second-leading scorer with 43 points on 34 goals and nine assists en route to second-team All-BIG EAST Conference honors. A two-time US Lacrosse High School All-American, she led Garden City High to four consecutive state titles from 2008-11.
The attacker will have a familiar face on the sidelines with Georgetown Head Coach Ricky Fried serving as the head coach of the national team.
"Caroline brings a left-handed attacking punch to the team, and her ability to feed and dodge will give us additional depth at that position," Fried said.
The moves bring the training team roster to 38 players who will compete for 18 spots on the 2013 U.S. women's national team that will defend its 2009 gold medal at the Federation of International Lacrosse (FIL) World Cup in Oshawa, Ontario.
Spencer and Tarzian join the U.S. women's national team prior to its first training weekend, Sept. 7-9 at UMBC. The team will next compete at the 2012 US Lacrosse Stars & Stripes event, Oct. 3-7 in Palo Alto, Calif.
Team USA will take on Team Australia, along with collegiate teams Cal and Stanford in weekend action that also includes Canada, England and Rikkyo University (Japan). The matchup against Australia is the first between the world's top two teams since 2009, when Team USA defeated Australia 8-7 to capture the gold medal at the FIL World Cup in Prague, Czech Republic.
The final 18-player U.S. women's national team roster is expected to be announced in February 2013.