The U.S. Army continues to be one of the most thoughtful of the services. Below is a superb list of responsibilities associated with the protection of civilians. Where the list goes wrong is in assuming that the military will have a major responsibility across all these elements. In fact US thinking continues to be severely flawed at each level of analysis:
Strategic: If the strategy is non-existent or corrupt to the bone, based on ideology or financial bribes rather than ethical evidence-based decision-support, it will inevitably fail in prolonged expensive ways because nothing done at the lower levels can overcome ignorant, arrogant, mis-directed strategy that refuses all ethical evidence-based decision-support.
Operational. If Whole of Government capabilities have been been developed that are agile, scalable, and truly represenative of all elements of national power, the campaign will inevitably fail (it may take a quarter century or longer, but it will fail) for lack of harmonization, legitimization, and the embedded inability to do what is needed in the manner that is needed (e.g. soft indigenously-embraced contributions rather than predatory corrupt practices).
Tactical. If the military is the only tool, and its insertion is bracketed by strategic idiocy, operational incoherence, and technical albatrosses (aviation, fuel-heavy mobilty, communications inadequate to “eight tribes” harmonization local to global, lack of language and culture skills), then however heroic the military might be in executing its often insane and all too often illegal unconstitutional orders, it will fail.
Technical: For 50 years the US military has been a pork pie. What we build has been determined by who bribes Congress the most effectively, and who offers retiring flag officers the most lucrative second career. It has also been gored by a lack of counterintelligence against religious and financial traitors, by a lack of honest design, honest operational testing and evaluation, and honest field commanders willing to blow the whistle as soon as possible. Four percent of the US military force takes 80% of the casualties, and gets 1% of the Pentagon budget. This is criminally insane and insanely criminal.
Since really waking up to all that is wrong in 1988, I have agonized over the broken US intelligence archipelago focused on spending money rather than producing intelligence, and on the broken US process for planning, programming, budgeting, and executing Whole of Government capabilities that are not at this time responsive to the public interest — they have been co-opted by the recipients of the public's revenue and are comprised of one-third waste, one-third treason, and one-third well-intentioned but over-whelmed good mired in a cesspool of bureaucratic corruption and political treason.
Below is an excellent list, additional commentary, and further references.