Question: Jonathan Clark is the older brother to a fellow soldier who was what? 

Context paragraphs:
John Schnitzer: Sergeant John P. Schnitzer (1854 – October 26, 1904) was an American soldier and wagoner in the U.S. Army who served with both the 23rd U.S. Infantry and 6th U.S. Cavalry in the New Mexico Territory during the Apache Wars.  He was awarded the Medal of Honor, along with First Lieutenant Wilber Wilder, for rescuing a fellow soldier under heavy fire while fighting the Apache at Horseshoe Canyon on April 23, 1882, which he received fourteen years later.

Jon Clark: Jonathan Clark is a British reality television personality and builder from Essex, who first rose to fame in 2015 by appearing on the ITV2 reality series "Love Island" where he came runner-up with fellow contestant Hannah Elizabeth.  In 2016, he joined the cast of "The Only Way Is Essex" with his brother Chris Clark,

Marie Magdelaine Mouron: Marie Magdelaine Mouron, also known as "Picard" and "La Garonne", (floruit 1696), was a French soldier.  She served in the French army disguised as a male from 1690 until 1696.  She served under the Duke of Noailles in Catalonia and participated in the Siege of Rosas in 1693.  Her biological gender was exposed after she was forced to medical attention after a duel with a fellow soldier.  In March 1696, she was arrested accused of desertion, during which her story was documented.  The documentation of her case is considered to have great historic value for several reasons: it documents a case of a female early modern age soldier without the sensationalism usually surrounding narratives of such occurrences; it also documents the life of a common foot soldier of the French army regardless of gender, as narratives of French foot soldiers of this epoch was quite rare.

Jonathan Clark (soldier): Jonathan Clark (August 1, 1750 – December 14, 1811) was an American soldier.  After saving his captain, major and colonel in the American Revolutionary War, he rose to the rank of major-general of the war survived.  His death.  He was the older brother of fellow soldier General George Rogers Clark and of Captain William Clark of the Lewis and Clark Expedition.

George Rogers Clark: George Rogers Clark (November 19, 1752 – February 13, 1818) was a surveyor, soldier, and militia officer from Virginia who became the highest ranking American military officer on the northwestern frontier during the American Revolutionary War.  He served as leader of the militia in Kentucky (then part of Virginia) throughout much of the war.  Clark is best known for his celebrated captures of Kaskaskia (1778) and Vincennes (1779) during the Illinois Campaign, which greatly weakened British influence in the Northwest Territory.  Because the British ceded the entire Northwest Territory to the United States in the 1783 Treaty of Paris, Clark has often been hailed as the "Conqueror of the Old Northwest".

Peter Randall (British Army soldier): Peter John Randall (20 August 1930 – 23 April 2007) was a British Army soldier and a recipient of the George Medal, and the RSPCA's Margaret Wheatley Cross, for his actions on 8 October 1954 where he saved the life of a fellow soldier and a military dog from a burning truck.

Jonathan Clark House: The Jonathan Clark House is a historic house located at 13615 N. Cedarburg Rd. in Mequon, Wisconsin.  The house was built in 1848 for Jonathan Clark, who migrated to the area from Vermont.  The home was built in the Greek Revival style and is built in fieldstone with a limestone front.  The house has also been used as a dentist's office.

Fragging: The term fragging is used to describe the deliberate killing or attempted killing by a soldier of a fellow soldier, usually a superior officer or non-commissioned officer (NCO).  The word was coined by U.S. military personnel during the Vietnam War, when such killings were most often attempted with a fragmentation grenade, sometimes making it appear as though the killing was accidental or during combat with the enemy.  The term fragging is now often used to encompass any means used to deliberately and directly cause the death of military colleagues.

Thompson Brothers Rock Art: The Thompson Brothers Rock Art is an inscribed rock located within Giant City State Park in Union County, Illinois.  Four names are carved into the rock, all but possibly one of which were inscribed by Union soldiers or supporters during the Civil War.  The two most prominent signatures belong to brothers Albert S. and T. W. Thompson; the former was a Union soldier, while the latter served as Deputy Provost Marshal and was responsible for locating Union deserters.  Union soldier Thomas L. Bailey also carved his name into the rock; the fourth name, A. Parker, may have been either a fellow soldier or a resident of the area who added his name after the war.  The rock was carved at a time when Union supporters and Southern sympathizers fought for control of southern Illinois, and as the Thompson family were among the most prominent Union supporters, it represents an attempt to physically claim the area for the North.  The Confederate sympathizers' inability to deface the names signifies their gradual loss of power in the area.  The rock is now one of the few surviving Civil War sites in Illinois.

Theodore, Philippa and companions: Theodore, Philippa, and companions were martyrs, who suffered crucifixion during the reign of Elagabalus.  Theodore of Perge was a Roman soldier, and Philippa was his mother.  Their companions who suffered martyrdom with them, included Socrates, a fellow soldier, Dionysius, a convert to Christianity who thitherto was a pagan priest, and Dioscorus.

Supporting paragraphs: Jonathan Clark (soldier) George Rogers Clark
Answer: surveyor, soldier, and militia officer