Theory of everything differ both from gravity and from electromagnetism. A further hurdle was the acceptance that in a TOE, quantum mechanics had to be incorporated from the start, rather than emerging as a consequence of a deterministic unified theory, as Einstein had hoped. Gravity and electromagnetism could always peacefully coexist as entries in a list of classical forces, but for many years it seemed that gravity could not even be incorporated into the quantum framework, let alone unified with the other fundamental forces. For this reason, work on unification, for much of the twentieth century, focused on understanding the three "quantum" forces:
Unified Task Force 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 of the United Nations