A new 12th edition of the Boy Scout Handbook was issued in the summer of 2009. That book contained new requirements for each rank which took effect on January 1, 2010. If a Scout has started work toward a rank before January 1, 2010, using requirements that were current before January 1, 2010, he may complete that rank only using the old requirements. Any progress toward a rank that is begun after January 1, 2010, must use the requirements as they are presented in the Boy Scout Handbook or in Boy Scout Requirements book.
This file contains a list of requirement changes for each rank: 
2010 Boy Scout Requirement Changes
http://www.troop451.org/index.php?option=com_docman&task=doc_download&gid=43&Itemid=58
