• Possible requirements to place weapons in space to ensure the security of the SPS; and • Possible need to internationalize the SPS to reduce its vulnerability. System deployment schedule and flexibility of service may affect the availability of frequency bands and orbit slots needed for the SPS, and flexibility of SPS service available may determine the degree of interest among potential national participants in an internationalized SPS. 4.3 VULNERABILITY Vulnerability of the SPS relative to terrestrial systems is determined by comparing the vulnerability of the spaceborne segment of the SPS and launch sites with the vulnerability of the terrestrial system's fuel supply line(s). • The spaceborne segment of the SPS is vulnerable to military adversaries and to saboteurs; ® SPS defensive measures may need to include Hardening against nuclear radiation, laser/particle weapons, and missiles, and A self-defense system; ® Launch sites are expected to be vulnerable in approximately the same manner as terrestrial plant sites, except that launch sites probably will have better security. • At ground rectenna sites it should be possible to use a redundant design, arranging rectenna modules in parallel so that partial destruction would only degrade rectenna performance. (Much of the cabling and heavy equipment could be placed underground.)
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