Reddit mentions of Leadership in the Crucible: The Korean War Battles of Twin Tunnels and Chipyong-ni (Volume 82) (Williams-Ford Texas A&M University Military History Series)

Although most countries that sent troops to Korea under the UN sent only small contingents, they more than made up for it in fighting ability. They absolutely fought in major battles as a matter of routine. To ease logistical issues these units were equipped from US and occasionally British supply chains. They had the same uniforms and weapons as whoever was supplying them so they'd often be indistinguishable from US or British troops except for some distinctive patches. That said, a few contingents would wear one or two distinctive items from their original uniform, such as a beret. Ethiopians wore a pith helmet for ceremonial duties and Turks wore a greatcoat, at least in the first winter.

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A few others were mentioned before, but I'd like to single out the French UN Battalion that fought with the US 23rd Regimental Combat Team, particularly at Chipyong-ni and Heartbreak Ridge as especially fine soldiers. They were highly regarded by the Americans and South Koreans they fought with and distinguished themselves in combat. They volunteered for Korea out of a sense of gratitude to the US for WW2 and a desire to regain French martial prestige after that war.

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Belgians fought alongside the British at Gloster Ridge before and during the Chinese 5th Phase Offensive in '51. The British regarded them as wildmen. Once after leaving their camp after a night of drinking, the Belgians fired on them with smoke rounds from mortars. Everyone thought it was pretty funny.

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Turkish troops were seen as being especially ferocious by US troops, sporting big mustaches and bigger knives. Reports on their combat performance were mixed but they were generally highly regarded. At some point in the winter of 1950 they captured a large unit of South Koreans that they mistook for enemies. If you see pictures of Turks capturing smug looking Asians wearing jackets quilted in a diamond pattern, that's likely from this incident. They were also instrumental in preventing the complete encirclement of the US 2nd Infantry Division at Kunu-ri and were lost almost to a man to save the division.

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This is just a sampling. The contributions of Ethiopia, Canada, Holland, and Australia were mentioned below.

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Sources:

https://www.amazon.com/Last-Round-British-Stand-Imjin/dp/1845135334/ref=sr_1_2?keywords=andrew+salmon&qid=1557427326&s=gateway&sr=8-2

https://www.amazon.com/Leadership-Crucible-Chipyong-ni-Williams-Ford-University/dp/1585442321/ref=sr_1_2?keywords=chipyong-ni&qid=1557427350&s=gateway&sr=8-2

https://www.amazon.com/This-Kind-War-Fiftieth-Anniversary/dp/1574883348/ref=sr_1_1?keywords=this+kind+of+war&qid=1557427376&s=gateway&sr=8-1