According to Rule 38A1r (Reinforcements and Replacements - Reinforcements - Concepts - Transfer/Arrive), an arrival is the same as receiving a reinforcement (Rule 38A1l). This rule states that the listed unit is received as a reinforcement in the specified district or command (in this case it is the West (France/West Germany) command). So, referring back to Rule 38A, a command-wide reinforcement appears in any friendly-owned city, resource center, or fortress in the command.
This qualifies the reinforcements appearing in Belgium. More.
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