Following the Yom Kippur War in October, 1973, the second United Nations Emergency Force (UNEF II) was established by the UN General Assembly in accordance with United Nations Security Council Resolution 340. UNEF II was given the mandate to supervise the implementation of Resolution 340 which demanded that an immediate and complete ceasefire between Egyptian and Israeli forces be observed and that the parties return to the positions they had occupied at 1650 hours GMT on 22 October 1973. Effectively, this meant supervising the redeployment of Egyptian and Israeli troops, and manning & controlling the buffer zones.
UNEF II operated at the Suez Canal sector and the Sinai Peninsula, with a headquarters initially in Cairo and later at Ismailia. UNEF II was active from October 1973 until July 1979. In July 1979, UNEF II comprised contingents from Finland, Ghana, Indonesia and Sweden.
This article lists amateur radio activities by UNEF II personnel who used a /4U callsign. This may not be a complete list. Additions/errors please to Alan 5B4AHJ. QSL images required for all calls without a blue link.
There were also numerous UNEF II stations QRV using /SU rather than /4U, including stations frrom Canada, Finland, Japan and USA.
Wikipedia United Nations Emergency Force