When the Iraqi military invaded on August 2nd 1990, the Kuwaiti military was mostly unprepared, but still put up a lot more resistance than the Iraqi regime expected. There was a battle near the town of al-Jahra where an understrength Kuwaiti armoured brigade fought against elements of two Iraqi Republican Guard divisions; there was limited fighting in Kuwait City, especially around the Emir's palace; the Kuwaiti air force was able to carry out numerous bombing runs on Iraqi forces, fight their navy, and held out in the south of the country too. However, all organised military resistance had collapsed by August 4th and the nation came under Iraqi regime control.

The remnants of the Kuwaiti military had three choices: hide, run, or surrender. Many were captured and sent to Iraq, from where many never returned. Those who fled went to Saudi Arabia - a number of aircraft managed to get there, as did parts of the armoured brigade I mentioned earlier, among others. Those forces were then reorganised and, when the Coalition ground offensive was launched in February 1991, they joined in the advance.

Of those who hid, a great many formed resistance groups against the Iraqi military occupation and would continue to fight until the end of the war. When Kuwait was liberated in February 1991 and the Kuwaiti military and police came back to reassume control of the country, they (alongside Kuwaiti resistance groups) took part in rounding-up collaborators and a large part of the minority Palestinian population in Kuwait, who were accused of having worked with the Iraqi regime because the Palestinian Liberation Organisation leadership had allied with Saddam Hussein. Hundreds of Palestinians would be tortured and murdered and hundreds of thousands forced to flee, most of them going to Jordan.

Hope this helped!