"2. For Training, First and Second Level tests and FEI Pony tests, a plain snaffle bridle is required with either a regular cavesson, a dropped noseband, a flash noseband (a combination of a cavesson noseband and a dropped noseband attachment) or a crossed noseband. Except for the FEI Pony tests, a crescent noseband is also permitted at these levels. Except for the crescent noseband, buckles and a small disk of sheepskin, which may be used in the intersection of the two leather straps of a crossed noseband, the noseband must be made entirely of leather or leather-like material. A padded noseband is allowed. Tests same as (2) above, or a simple double bridle (bridoon (snaffle) and bit (curb) and curb chain, lip strap and rubber or leather cover for curb chain optional, cavesson noseband only)."
More here http://www.usef.org/documents/licens...dressequip.pdf