As U.S. Army Trainees progress through the White Phase of Basic Training or One Station Unit Training, they build on the confidence they've gained through qualifying with their Back-Up Iron Sites (BUIS) to utilize the M68 Close Combat Optic! Utilizing the crawl-walk-run method of instruction allows Drill Sergeants to progress Trainees through basic rifle marksmanship so they're both efficient and effective marksmen when they reach their first duty station. Close Combat Optics allows Trainees to