Assaulting or snooping around an aircraft ramp is extremely difficult due to the wide open flat areas. An old grizzly Marine from WWII told me of how the Ghurkas loved to fool with the US sentries by chalking their boots at night.
When the Sgt.of the guard would arrive to do a quick check, the ramp sentries would have no reports of seeing anyone. The Sgt. would then have them raise their boots to see how many times the boot heels had been chaulked by unseen Ghurkas.
OOOOGA BOOOOOGA
He observed an exercise where the british troops were to defend a hilltop from the Ghurkha regiment. The brits laid out a textbook perimeter, dug themselves in, and settled in for the night. Both sides were equiped with paintball rifles.
In the morning the commander mustered the british troops and asked if they had sucsessfully defended their hilltop. Yes they replied, no encounters and no casualties. Very well then, everybody look at the soles of their boots. They all had paint marks on the bottom of their boots.
During the night the Ghurkas had infiltrated and tagged every one of them without detection. The Ghurkas were in Belize to guard against Guatemalan incursion, and inspired fear in the Guat soldiery.