Jurisdiction — Territorial — Foreign armed forces — Criminal jurisdiction of receiving State — Acts of United States serviceman unconnected with official duties — Concurrent jurisdiction of sending and receiving States — NATO Status of Forces Agreement, 1951, Article VII(3) — Waiver of jurisdiction by receiving State — Article VII(8) of Agreement — Principle of ne bis in idem — Applicability — Whether decision to stay proceedings taken by the United States military authorities constitutes a bar to further proceedings in the Federal Republic of Germany — The law of the Federal Republic of Germany