LETTER BANK XV

Credit: NPR Weekend Edition Sunday Puzzle
February 21, 2010
Will Shortz

In a letter bank, the letters of one word are used - and repeated as necessary - to spell a longer word or phrase. For example, IMPS is a letter bank for MISSISSIPPI. Only the letters I, M, P, and S are needed to spell MISSISSIPPI. Using the letters in the name PROUST as a letter bank,  can you spell out a frequently seen bumper sticker or banner?

HINT:
The bumper sticker/banner is of a patriotic nature.

Answer:

SUPPORT OUR TROOPS