Unified field theory classical field theory and, two years later, that of Theodor Kaluza, who extended General Relativity to five dimensions. Continuing in this latter direction, Oscar Klein proposed in 1926 that the fourth spatial dimension be curled up into a small, unobserved circle. In Kaluza–Klein theory, the gravitational curvature of the extra spatial direction behaves as an additional force similar to electromagnetism. These and other models of electromagnetism and gravity were pursued by Albert Einstein in his attempts at a classical unified field theory. By 1930 Einstein had already considered the Einstein–Maxwell–Dirac System [Dongen]. This system is (heuristically) the super-classical [Varadarajan] limit
Unified Task Force on 4 May 1993. Unified Task Force The Unified Task Force (UNITAF) was a US-led, United Nations-sanctioned multinational force, which operated in Somalia between . A United States initiative (code-named Operation Restore Hope), UNITAF was charged with carrying out United Nations Security Council Resolution 794 to create a protected environment for conducting humanitarian operations in the southern half of the country. After the killing of several Pakistani peacekeepers, the Security Council changed UNITAF's mandate issuing the Resolution 837 that establishes that UNITAF troops could use "all necessary measures" to guarantee the delivery of humanitarian aid in accordance to Chapter VII