text: Chapter 5
  committees, particularly a certain freedom of movement necessary for the accomplishment of their duties
  (such as visits to labor detachments or receipt of supplies). This freedom of movement does not require
  complete freedom, however; for example, a camp commander may restrict movement for security reasons.
  5-137. All facilities must likewise be accorded to internee committee members for communication by post
  and telegraph with the detaining authorities, the protecting powers, the ICRC, and organizations that give
  assistance to internees. Internee committee members in labor detachments are to enjoy similar facilities to
  communicate with their internee committee in the principal place of internment. Such communications may
  not be limited, nor considered as forming a part of the quota for letters and cards mentioned in article 107 of
  the GC. Censorship of such communications with the protecting powers, the ICRC, or other organizations
  dedicated to the welfare of the internees is not prohibited, but the detaining power should ensure that delays
  do not occur to the disadvantage of the internees.
  Notification of Measures Taken Regarding Internees
  5-138. Immediately upon interning protected persons, the detaining power must inform them, the power to
  which they owe allegiance, and their protecting power (or the ICRC if it assumed the duties of the protecting
  power) of the measures taken. The detaining power must likewise inform the parties concerned of any
  subsequent modifications of such measures (GC art. 105).
  Internment Card
  5-139. As soon as a person is interned, or at the latest no more than one week after his or her arrival in a
  place of internment (normally the theater internment facility), and likewise in cases of sickness or transfer to
  another place of internment or to a hospital, an internee must be enabled to send direct to his or her family
  and to the central information agency for protected persons described in paragraph 1-111 an internment card
  that is similar, if possible, to the model in Annex III to the GC, informing their relatives of his or her detention,
  address, and state of health. The cards must be forwarded as rapidly as possible and may not be delayed in
  any way (GC art. 106). In US practice, the National Detainee Reporting Center, described in paragraphs 3-
  86 through 3-89, has served as the National Protected Person Information Bureau responsible under the GC
  for various functions, including for receiving and transmitting information required by the GC to the Powers
  concerned, through the intermediary of the protecting powers and the Central Information Agency for
  protected persons (see DOD Law of War Manual, 10.31.2 and 10.31.4). The role of the Central Information
  Agency for protected persons has been performed in many conflicts by the ICRC Central Tracing Agency
  (GC art. 136, 137, 138, 139, 140; see DOD Law of War Manual, 10.31.3).