25: Gulf Coalition

From Wikipedia:
"Coalition of the Gulf War"

 Country:                    Soldiers:                         Participated In:

United States	697,000	Operation Desert Shield Operation Desert Storm Battle of Khafji Battle of 73 Easting Battle of Al Busayyah Battle of Phase Line Bullet Battle of Medina Ridge Battle of Wadi Al-Batin Battle of Norfolk
Saudi Arabia	60,000 – 100,000	Operation Desert Shield Battle of Khafji Operation Desert Storm
United Kingdom	53,462	Operation Granby
Egypt	20,000	Operation Desert Storm
France	18,000	Opération Daguet
Syria	14,500	Operation Desert Storm
Morocco	13,000	Security Personnel
Kuwait	9,900	Invasion of Kuwait Operation Desert Storm
Oman	6,300	Operation Desert Storm
Pakistan	4,900 – 5,500	Backup team
Canada	4,600	Operation Friction
United Arab Emirates	4,300	Operation Desert Storm
Qatar	2,600	Battle of Khafji
Bangladesh	2,300	(Operation Moru-prantar) Security Personnel including 2 field Ambulance teams
Italy	1,200	Deployed 8 Panavia Tornado strike attack aircraft, Naval deployment
Australia	700
Netherlands	700	Naval deployment; Air Force deployments of Surface-to-Air Missiles to Turkey and Israel
Niger	600	Patroller group
Sweden	525	Field hospital
Argentina	500	Navy / Air Force
Senegal	500	Base Guards
Spain	500 on the field / 3,000 off the coast	Engineers
Bahrain	400	Base Guards
Belgium	400	Base Engineers
Poland	319	Operation Simoom Naval & medical deployment
South Korea	314	Medical & transportation support
Czechoslovakia	200	Operation Desert Shield Operation Desert Storm Czechoslovakia in the Gulf War
Greece	200	Pilots
Denmark	100	HDMS Olfert Fischer (Niels Juel Class Korvet)
New Zealand	100	2 C-130 Hercules transporter aircraft
Hungary	50
Norway	280	Naval vessel & Field hospital + intelligence information