hall walker
n.— «The departure of Adm. William J. (“Fox”) Fallon gives us a rare insight into a secret world of relationships between the highest-ranking general officers and their civilian masters.…Eventually, in the words of one Pentagon official, Fallon became what is called a “hall walker,” with less and less responsibility and little to do.» —“Petraeus Wins in Iraq Battle, Kills Iran War” by William M. Arkin Washington Post: Earl Warning Mar. 13, 2008. (source: Double-Tongued Dictionary)