I haven’t found a list of which players (David Lennon you probably have it in your notes, there’s a column from you in the archives) but here’s a note From mlb.com August 13, 2008
CEO Fred Wilpon, general manager Omar Minaya, Manuel, members of his coaching staff and about 15 Mets players visited Walter Reed on Wednesday morning. The contingent gathered with patients at the facility for a lunchtime cookout complete with hot dogs, “a couple of” Mets fans — according to Manuel — and one person who was rather impressed at David Wright’s friendship with LaDanian Tomlinson.
I don’t see any details about 2009 or other years.
Those 10 players were wrong in 2008, so long as they don’t have a valid excuse like Beltran did this year or a questionable one like Castillo did.