c.
United States military pilots flying over the foreign country which is not a Contracting State of ICAO shall comply with the national practices of that country and any special provisions of the bilateral agreements the United States may have with that country. in the absence of any national practice or bilateral agreements governing rules of the air, the ICAO rules and procedures shall be followed.

d.
During routine Operations United States military pilots, when flying over the high seas, shall comply with ICAO rules and procedures. United States Naval aviators shall comply with procedures as set forth in current OPNAVINST 3770.4.

7-5 TERRITORIAL APPLICATION OF ICAO PROCEDURES - The ICAO has recommended standard terms and procedures for aircraft Operations on an international basis. The various countries which subscribe to ICAO have implemented these terms and procedures with variations or deviations according to their own international relations, national regulations and needs. This chapter will present standard ICAO rules and procedures applicable on a worldwide basis. When there are national deviations from standard ICAO procedures, which are filed with ICAO, these differences will be noted in the individual country listing in the applicable DoD FLIP, AREA PLANNING (AP 1, 2, 3 and 4) Enroute Charts and in the Flight Information Handbook (FIH).
7-6 ICAO AIR TRAFFIC SERVICES - There are eight designated ICAO Regions throughout the world which are
shown on the ICAO Regional Chart. For the purpose of assisting and controlling aircraft within each ICAO Region, the airspace has been further divided into Information Regions and Controlled
Airspace. The basic breakdown of the ICAO Region begins with the Flight Information Region (FIRs).
a. A Flight Information Region is an airspace of defined dimensions within which Flight Information Service (FIS) and Alerting Service is provided. This service is used basically to notify appropriate organizations regarding aircraft in need of assistance. It is provided either by a Flight Information Center (FIC) or an Area Control Center (ACC).
(1) In some instances, Upper Flight Information Regions (UIRs) have been established above the Flight Information Regions. The Upper Information Region and Flight Information Region have the same basic function, yet the Upper Information Region may cover a number of Flight Information Regions. The lower limit of the Upper Information Region is normally coincident with the upper limit of the Flight Information Regions which they cover. Usually the Flight Information Center or Area Control Center of one of the underlying Flight Information Regions furnishes the appropriate provisions of the Air Traffic Service within the Upper Information Region.
(2)
Flight Information Service is established for the purpose of providing advice and information useful to the safe and efficient conduct of flight. Air Traffic Control is not provided. Flight Information Service will use the terms "Advise" or "Suggest" in ground to air communications to preclude mandatory compliance. The service provided includes Sigmets, Navigational Aids status, airfield conditions and any other information likely to affect safety. Service to IFR flights shall also include weather conditions at departure, destination and alternate airports; traffic hazards to aircraft operating outside Control Areas/Zones; and for overwater flights, when practicable and when requested by the pilot, information on surface craft in the area. Service to VFR flights shall also include weather conditions along the route of flight which are likely to make VFR Operations impractical. (NOTE: Flight Information Service does not relieve the pilot-in-command of any of his responsibilities. The final decision regarding suggestions to alter flight remains with the pilot.

b.
When Air Traffic Control is implemented within the airspace of an Flight Information Region, the area is designated as Control Area/Flight Information Region. In some areas, the CTAs (Control Areas) may cover only a portion of the Flight Information Region. The Area Control Center will exercise positive control within that portion designated at Control Area, but furnish only Flight Information Service within the remainder of the Flight Information Region. Air Traffic Control service takes precedence over Flight Information Service within these areas.
　
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