Question: Which official state flag is used by the stadium handlers of Alph Phi Omega?
Context: The flag of the Commonwealth of Massachusetts is the subnational flag of Massachusetts.  It has been represented by official but limited-purpose flags since 1776, though until 1908 it had no state flag "per se" to represent its government.  A variant of the white flag with blue seal was carried by each of the Massachusetts volunteer regiments during the Civil War alongside the National Colors.  An exception were the two "Irish regiments" (the 9th and 28th Volunteers), each of which was permitted to carry an alternative green flag with a harp symbol.  The state currently has three official flags: a state flag, a "naval and maritime flag" (despite it no longer having its own navy), and a governor's flag. The flag of Texas is the official flag of the State of Texas.  It is defined by law as follows: The World's Largest Texas Flag is a Texas flag used by the stadium handlers of Alpha Phi Omega (ΑΦΩ or APO), a national co-ed service fraternity, at the University of Texas at Austin in displays at football pre-game shows, at pep rallies, or for other purposes. PREDITOR (PREDIction of TORsion angles) is a freely available web-server for the prediction of protein torsion angles from chemical shifts. For many years it has been known that protein chemical shifts are sensitive to protein secondary structure, which in turn, is sensitive to backbone torsion angles. torsion angles are internal coordinates that can be used to describe the conformation of a polypeptide chain.  They can also be used as constraints to help determine or refine protein structures via NMR spectroscopy.  In proteins there are four major torsion angles of interest: phi, psi, omega and chi-1.  Traditionally protein NMR spectroscopists have used vicinal J-coupling information and the Karplus relation to determine approximate backbone torsion angle constraints for phi and chi-1 angles.  However, several studies in the early 1990s pointed out the strong relationship between 1H and 13C chemical shifts and torsion angles, especially with backbone phi and psi angles.  Later a number of other papers pointed out additional chemical shift relationships with chi-1 and even omega angles.  PREDITOR was designed to exploit these experimental observations and to help NMR spectroscopists easily predict protein torsion angles from chemical shift assignments.  Specifically, PREDITOR accepts protein sequence and/or chemical shift data as input and generates torsion angle predictions for phi, psi, omega and chi-1 angles.  The algorithm that PREDITOR uses combines sequence alignment, chemical shift alignment and a number of related chemical shift analysis techniques to predict torsion angles. PREDITOR is unusually fast (<40 s per protein) and exhibits a very high level of accuracy.  In a series of tests 88% of PREDITOR’s phi/psi predictions were within 30 degrees of the correct values, 84% of chi-1 predictions (3-state predictions) were correct and 99.97% of PREDITOR’s predicted omega angles were correct.  PREDITOR also estimates the torsion angle errors so that its torsion angle constraints can be used with standard protein structure refinement software, such as CYANA, CNS, XPLOR and AMBER.  PREDITOR also supports automated protein chemical shift re-referencing and the prediction of proline cis/trans states.  PREDITOR is not the only torsion angle prediction software available.  Several other computer programs including TALOS, TALOS+ and DANGLE have also been developed to predict backbone torsion angles from protein chemical shifts.  These stand-alone programs exhibit similar prediction performance to PREDITOR but are substantially slower. Sigma Sigma Omicron (ΣΣΟ) was a national collegiate sorority operating in the United States from November 1, 1920 to 1933.  The Alpha chapter was chartered at New York University.  In July 1927, the sorority changed its name to Sigma Phi Beta.  The sorority was absorbed by Phi Omega Pi. This is a listing of notable alumni and honorary members of Alpha Phi Omega, an international service fraternity.  The list includes members of the fraternity who have become well known or who have attained high ranking positions in their particular career field, such as government and politics, academia, science and technology, sports, or business.  Notable alumni refers to both individuals who joined individual Alpha Phi Omega chapters as students who later went on to distinguish themselves in their personal or professional lives and advisors who are members of the faculty, staff, Scouting or community selected by a chapter to advise them.  An honorary member refers to individuals who were offered honorary membership in either various Alpha Phi Omega chapters or Nationally as non-students. The state flag of Washington consists of the state seal, displaying an image of state namesake George Washington, on a field of dark green with gold fringe being optional.  It is the only U.S. state flag with a field of green as well as the only state flag with the image of an American president.  The Secretary of State regulates flag protocol related to the state flag, as well approving replica flags for commercial sale and other standards related to the flag. Alpha Phi Omega chapters in the United States are the basic organizational divisions of the Alpha Phi Omega fraternity at accredited U.S. college and university campuses.  These chapters execute the fraternity national programs to provide opportunities for the development of service projects and programs, social awareness, friendship and leadership skills. Delta Phi Omega (commonly referred to as DPO, or ΔΦΩ) is a nationally-based, South Asian-interest, multicultural sorority in the United States, with over 2200 sisters in twenty-two chapters and twenty-four colonies across the nation.  It is categorized as a social, service and philanthropy-based Greek letter organization whose main focus is to empower women and promote cultural awareness through involvement with their universities and communities.  It has joined organizations such as the National APIA Panhellenic Association (NAPA) to better convey its efforts to promote the greater good alongside other communities.  Delta Phi Omega Sorority, Inc. is the largest South Asian interest-based sorority in the nation. The founding of Alpha Phi Omega in the Philippines in 1950 was preceded by an APO service project conducted just after World War II.  Manila, the capital of the former Commonwealth of the Philippines, had been devastated during the war.  Many universities, utilised for military purposes, were in ruins.  Knowing that the education of young people was a vital necessity for the country to get back on its feet, a number of Alpha Phi Omega members in Texas and the Pacific Northwest, having served as soldiers in the Philippines, organised book drives on their campuses.  The successful project gathered hundreds of textbooks, used but usable, from libraries and students and sent to the Philippines to help re-stock the many burnt-out college libraries in Manila.
Answer: The flag of Texas