SIMI VALLEY, CA -- Pentagon leaders are concerned about the health of the Army's Patriot force, particularly the stress that high operational tempo and limited deployment predictability is having on readiness, driving soldiers to leave units that provide the cornerstone of air and missile defense for deployed forces and allies. A senior defense leader here said the Army is paying attention to the negative impacts on solider readiness and family well-being associated with high demand for the service’s main air-...