Oh and the Golden Talons should be in the military unit names list (WWII US 17th Airborne Division i think).
Good catch! I fixed it now.
As for the Historical Units, this was the best I could come up with:
All Americans - US 82nd Airborne, pretty clear cut in this case.
Belgian Fusiliers - Descended from Belgian Infantry regiments, in which line soldiers are known as Fusiliers. In WWII entire battalions of Belgian Fusiliers were formed for the Free Belgian Forces that were formed in exile.
Big Red One - US 1st Infantry Division, another clear cut case.
Black Watch - The 42nd Highland Regiment of Foot, later known as the Black Watch. But why are they separate from the Royal Black Watch Regiment that guards the First Lord?
Cameron Highlanders - Originally the 79th Regiment of Foot in the British Army, they became the Queen's Own Cameron Highlanders in 1881. Queen Victoria was very fond of this regiment, which is why she made herself their patron.
Desert Rats - A reference to the British 7th Armored Division of WWII, currently the 7th Armored Brigade.
Gurkha Rifles - Originally a force of regiments in the British Indian Army, recruited from Nepalese hillmen, there are currently two successors to these units. The British Army with its Royal Gurkha Rifles, but also the Brigade of Gorkhas in the Indian Army.
King's Own Scots Rifles - Most likely a reference to the Cameronians (Scottish Rifles), created from 26th and 90th regiments in 1881 and considered descendants of the regiments that fought for Richard Cameron, a 17th century religious reformer who led an armed rebellion against the Scottish Crown, in an attempt to keep the Church of Scotland free of politically appointed bishops. Cameron was killed in battle in 1680. The regiment was disbanded in 1968.
Latvian Rifles -Elite units of ethnic Latvian soldiers formed in WWI by the Russian Imperial Army. Most of them defected to the Soviet cause in 1917 and became a pillar of the early Red Army's military strength. Many of the commanders became leaders of the Red Army until Stalin purged them in the 1930's.
New Delhi Grenadiers - A reference to the Grenadiers Regiment of the Indian Army? This one is a little ambiguous, but I thought the reference was rather strong.
Philippine Division - The nickname for the old 12th Infantry Division of the US Army, disbanded in 1947.
Red Diamond - Nickname for the US 5th Infantry Division.
Royal Irish Fusiliers - Irish regiment of the British Army formed in 1881 by the amalgamation of the 87th and 89th Regiments of Foot. It was especially active in WWI, but served in WWII as well. Disbanded in 1968.
Screaming Eagles - Nickname for the US 101st Airborne Division.
Texas Rangers - A paramilitary law enforcement unit that dates back to the Texan War of Independence.
The Vein-Openers - Nickname of the old British 29th (Worcestershire) Regiment of Foot. They earned this nickname from their involvement in the Boston Massacre, becoming the first British regiment to draw blood against the growing American patriot movement.
The Golden Talon - As Rainbow 6 said, most likely a reference to the 17th Airborne Division of the US Army, known as
the Golden Talons.
Welsh Foot - While there have certainly been a large number of Welsh infantry units over the centuries, this title seems to be a reference to the 41st (Welch) Regiment of Foot, formed in 1719 and amalgamated with 69th Regiment of Foot in 1881 to create the Welch Regiment. That unit survived until 1969.