It is difficult to predict the future actions of the US military and government, but it is unlikely that the US will only fight proxy wars in the aftermath of the Afghanistan conflict. While the US experienced a significant setback in Afghanistan, it has not abandoned its role as a global military power and is likely to continue to engage in a variety of military operations and strategies as it sees fit to protect its interests and those of its allies.
Proxy wars, where one country supports and fights through another country or group, have been a common strategy for many nations throughout history, including the US. However, they are not always a preferred option because they can be unpredictable, unreliable, and can lead to unintended consequences. The US has also shown a willingness to use direct military force when it deems it necessary, as evidenced by recent military actions in Syria and Iraq.
Ultimately, the US military strategy will depend on a variety of factors, including the specific circumstances of each conflict, the goals and objectives of the US government, and the military capabilities of the US and its adversaries. While the Afghanistan conflict may have led to a reassessment of US military strategy, it is unlikely to result in a complete shift towards proxy wars as the sole means of engagement.
While the US withdrawal from Afghanistan was a significant setback for its military objectives in the region, it is important to note that the US has continued to engage in military action in other parts of the world, such as in Syria and Iraq, and has also increased its focus on countering cyber threats and emerging technologies.
Additionally, the US has a long history of engaging in direct military action when it considers it necessary, such as in the Gulf War and the Iraq War. While there may be increased caution and scrutiny over future military engagements, it is unlikely that the US will completely shift to exclusively engaging in proxy wars.
Overall, the US military strategy is likely to continue to evolve and adapt to changing global threats and challenges, with a focus on maintaining its military capabilities and defending its national interests.