The squad includes 12 2008 Olympic gold-medalists, including Tobin Heath and Lauren Cheney, who are among seven collegians Sundhage has brought into camp.
Sundhage's roster features 19 WPS players, six college seniors who should be high picks in the upcoming WPS Draft, and Cal junior Alex Morgan.
Midfielder Christine Nairn, who was at the December camp, was not called in for January as she recently finished a training camp with the U.S. U-20s, who are preparing for Concacaf qualifying to be held later this month in Guatemala.
Goalkeeper Jillian Loyden, Hope Solo's back-up for St. Louis Athletica, is the lone player called up for the senior team for the first time.
Loyden was recently named goalkeeper of the year in Australia's W-League where she was on loan to the Central Coast Mariners.
Six uncapped players are in camp, the last before Sundhage selects an 18-player roster for the annual Algarve Cup, which begins Feb. 24 in Portugal.
During its stay at the HDC, the USA will scrimmage South Korea twice. The Koreans are also training in Southern California for three weeks.
GOALKEEPERS (4): Nicole Barnhart (FC Gold Pride), Jillian Loyden (St. Louis Athletica), Alyssa Naeher (Penn State Univ.), Hope Solo (St. Louis Athletica)
DEFENDERS (8): Rachel Buehler (FC Gold Pride), Lori Chalupny (St. Louis Athletica), Stephanie Cox (Los Angeles Sol), Amy LePeilbet (Boston Breakers), Heather Mitts (Philadelphia Independence), Meghan Schnur (Sky Blue FC), Brittany Taylor (Univ. of Conn), Cat Whitehill (Washington Freedom)
MIDFIELDERS (7): Yael Averbuch (Sky Blue FC), Shannon Boxx (Los Angeles Sol), Tobin Heath (Univ. of North Carolina), Lori Lindsey (Philadelphia Independence), Carli Lloyd (Sky Blue FC), Heather O'Reilly (Sky Blue FC), Megan Rapinoe (Chicago Red Stars)
FORWARDS (7): Lauren Cheney (UCLA), Ella Masar (Chicago Red Stars), Alex Morgan (Univ. of California), Casey Nogueira (Univ. of North Carolina), Kelley O'Hara (Stanford Univ.), Amy Rodriguez (Philadelphia Independence), Abby Wambach (Washington Freedom)