So far as your dress is concerned, that is immaterial. But as a soldier you know that every soldier has got a uniform dress according to the army etiquette of regulation. Therefore, the army of Krishna Consciousness must have at least the tilak on the forehead in all conditions. For your business you can wear your naval service uniform; similarly, if you have tilak on your forehead as a soldier of Krishna Consciousness, you may not have so much objection, because it is essential.
Letter to Robert Hendry, 3 August, 1969