Final answer:
In a Parade, Rest position, the right hand is placed in the palm of the left with the right thumb over the left, forming an "X".
Step-by-step explanation:
In Parade, Rest, place the right hand in the palm of the left, right thumb over the left to form an "X".
This position is part of a military drill or ceremonial instruction, indicating a stance of respect and attention while not actively marching. Parade rest is a common element in military parades as well as various ceremonial events.
Remember that while at this position, it is important to maintain proper posture and stillness.