No, the US military doesnt answer to a political party (democrat or republican). The US military answers to the government in place. Even if someone from an outlier party comes to power tomorrow the US military will still follow his government policies/orders. US military is not the armed wing of a single party. However, China's case is different since the PLA is essentially the CCP's military not China's military . So in case the CCP loses power tomorrow, what happens to its armed wing as i said? Its a genuine question. Since it might cause alot of complications even from a managerial/leadership perspective.
Which sects are you talking about in the CCP? Or you mean other political parties ?
Let me introduce to you two sentences Mao Zedong once said:
1,中国共产党的最终目标是消灭中国共产党。
The ultimate goal of CCPs is to eliminate CCPs. If a political party cannot tolerate the existence of other parties, it wants to be the emperor.
2,党外无党,帝王思想。党内无派,千奇百怪。
If a political party cannot tolerate factional competition within itself, it will inevitably lead to chaos and demise.
First of all, you need to understand that the CCP is just a temporary institution set up to achieve its goals. Mao Zedong means that the existence of CCP itself has violated the values it believes in. The CCP ultimately wants to create a world without a country, a political party, a class or a war. So in the end, CCP needs to perish. Whether we succeed or fail, it will perish.
Secondly, it is different from what Westerners imagine. There are many parties in China, and the Chinese government is actually a ruling coalition composed of the CCP and eight political parties. There are many non CCP senior officials in the Chinese government. For example, Song Qingling, a member of KMT, once served as the national president of PRC. This position is similar to that of the President of Germany.
en.m.wikipedia.org
There are also many factions within CCPs, and CCPs never oppose factional competition. For example, the CCP leftists represented by Mao Zedong and Xi Jinping. The CCP Rightists represented by Deng Xiaoping and Jiang Zemin. Liu Shaoqi and Bo Xilai are the CCP extreme leftists. The Communist Youth League represented by Hu Jingtao and Li Keqiang, etc. The Chinese political tradition does not deny human nature, so the Chinese believe that if we forcibly wipe out human nature and prohibit factional struggle, it will inevitably lead to greater chaos and disaster.
However, there is a bottom line and tacit understanding in the party struggle in China. Once someone crosses the red line in an attempt to split the CCP's unity, he will be collectively excluded and severely punished. For example, Bo Xilai and Wang Yang once fought fiercely, causing division almost like Trump. In the end, Bo Xilai was sent to prison, and Wang Yang was replaced as alternate prime minister by Li Keqiang.