MARSHALL - Amber Streff and Aaron Walling announce their engagement. Parents of the couple are Kevin Streff of Canby, Carol Rains of The Colony, Texas, and Lon and Jean Walling of Milroy. Streff is a 2004 graduate of The College of St. Benedict and Walling is a 2004 graduate of Dakota State University. The couple is employed at USBank in Marshall. A Dec. 17, 2010, wedding is planned in Canby.