Glossary - 5 OPORD operation order OPSKED operational schedule ORP objective rally point OT observer-target PB patrol base PCC precombat checks PCI precombat inspection PDF principal direction of fire PI probability of incapacitation PIR priority intelligence requirements PL platoon leader PLD probable line of deployment PLOT-CR purpose, location, observer, trigger, communication method, resources (a format for planning fire support) PLT platoon POL petroleum, oils, and lubricants PRI primary protection a piece of equipment, natural or artificial, that is used to construct an anchor PSG platoon sergeant PSI pounds per square inch PZ pickup zone R rifleman R&S reconnaissance and surveillance RACO rear area combat operations RAP rocket-assisted projectile rappel seat a rope harness used in rappelling and climbing RED risk-estimate distance REQ required rerouted figure 8 knot anchor knot that also attaches a climber to a climbing rope RFA restrictive fire area RFL restrictive fire line RFLM rifleman RHB Ranger Handbook ROE rules of engagement round turn with two half hitches a constant tension anchor knot RP release point RTO radio operator S-2 intelligence staff officer S-3 operations staff (and training) officer