FILE - In this Nov. 13, 2011, file photo, referee Scott Green makes a call in the second half of an NFL football game between the Seattle Seahawks and Baltimore Ravens in Seattle. The NFL's on-field officials say the league planned to lock them out rather than negotiate a new contract. "Lockout seems to be their negotiating strategy with everyone," said Green, president of the NFLRA, clearly referring to the lockout of the players in 2011. Members of the NFL Referees Association were locked out June 3 after talks broke down. The league has been contacting replacement officials. (AP Photo/Elaine Thompson, File)

FILE - In this Nov. 13, 2011, file photo, referee Scott Green makes a call in the second half of an NFL football game between the Seattle Seahawks and Baltimore Ravens in Seattle. The NFL and referees' union reached a tentative agreement on Wednesday, Sept. 26, 2012, to end a three-month lockout that triggered a wave of frustration and anger over replacement officials and threatened to disrupt the rest of the season. (AP Photo/Elaine Thompson, File)

A C-17 from the 446th Airlift Wing, Air Force Reserve from Joint Base Lewis McChord flies over the Seattle Seahawks' stadium moments before kickoff as part of the Seattle Seahawks NFL salute to service for military veterans on Veterans Day weekend before the NFL football game, Sunday, Nov. 13, 2011, in Seattle. The Seahawks beat the Baltimore Ravens 22-17. (AP Photo/Elaine Thompson)