Nearly all of the 40 reservist pilots from 69th Squadron have refused to join a one-day training exercise this week. And in a further sign of growing concern among Israel's military leadership, 10 former Israeli Air Force chiefs published an open letter calling on Mr Netanyahu to "stop and find a solution" to the crisis, given the level of protest among pilots and aircrews. Threatened boycotts by reservists in Israel are not uncommon, but the scale and seniority of those now involved is unprecedented