It is really difficult to do realistic live fire testing on this type of system and such testing is absolutely required in order to "fine-tune" the critical parts of the software. The US military will benefit greatly from having access to the data from actual use of the system, even when the intercepts are unsuccessful.
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Palestinians report third round of Israeli airstrikes in southern Gaza (Haaretz)
from the article: U.S. Congress gives Obama okay to fund Israel rocket defense