"Over grown military establishments are under any form of government inauspicious to liberty, and are to be regarded as particularly hostile to republican liberty"

This quote by George Washington speaks to the threats of a big military facility. He is alerting that such an establishment, despite the form of federal government, is hostile to liberty. He is particularly worried about the risk to republican liberty, which is based on the idea of self-governance. He believes that a big military establishment can cause a concentration of power in the hands of a couple of, which can lead to the erosion of specific flexibilities. He is also alerting that a big military facility can cause a culture of militarism, which can cause a neglect for the guideline of law and the rights of residents. In other words, Washington is warning that a big military establishment can be a risk to liberty and need to be prevented.