本版本中的陈述除了历史事实的陈述外，构成了1995年《私人证券诉讼改革法》的含义中的“前瞻性陈述”。前瞻性陈述涉及风险和不确定性，这些风险和不确定性可能导致我们的实际结果与这些在这些陈述中表达的。可能引起此类差异的因素包括：政府和客户优先级和要求的变化（包括政府的预算限制，国防支出的转变以及客户短期和远程计划的变化）；我们能够估算未来合同成本并有效执行合同的能力；采购过程和政府法规的变化以及我们遵守此类要求的能力；我们以负担得起的生命周期成本交付产品和服务的能力并在市场中竞争；自然和环境灾难和政治动荡；我们执行战略计划的能力，包括关于股票回购，股息，资本支出和战略收购的能力；美国和全球的不利经济状况；健康流行病，大流行病和类似的爆发，包括COVID-19大流行； changes in key estimates and assumptions regarding our pension and retiree health care costs; security threats, including cyber security threats, and related disruptions; and other risk factors discussed in our filings with the U.S. Securities and Exchange Commission. There may be other risks and uncertainties that we are unable to predict at this time or that we currently do not expect to have a material adverse effect on our business, and we undertake no obligation to update any forward-looking statements. You should not place undue reliance on any forward-looking statements that we may make. This release also contains non-GAAP financial measures and includes a GAAP reconciliation of these financial measures. Non-GAAP financial measures should not be construed as being more important than comparable GAAP measures.