in your hand, examine it and identify the smaller end. The smaller end may be identified by measuring the outside diameter one-third of the distance from each end of the egg, the end farthest from the greater cross-sectional circumference will be the "small end." This is the end upon which the sucking will occur. The other end is the large end and, therefore, will be the end furthest from you while sucking. Using a fine tipped felt marker, mark the ends of the egg now to differentiate them later without having to repeat this determination process. Mark the small end with an "S" (for small or suck) and the large end with an "O" (for the other end"). 4. Piercing the Egg . Successful sucking of an egg requires that a small hole (see below for recommended sizes) is made in each end of the egg. The following guidance is provided to assist the staff officer in establishing a hole in each end of the egg: a.    Using a small pointed object (pin, pen, unfolded paperclip, staff officer's head, etc.) to make the small holes in each end of the egg b.    Make the "S" hole, through which all egg contents will flow in a short explosive journey, 5 mm in diameter; c.    Make the "O" hole, through which only air will travel, about 2 mm in diameter; d.    Place the holes at the points where the imagined line of the longitudinal axis of the egg would intersect its shell;