Franklin Roosevelt actually said...

"The above-named officers shall, while under the jurisdiction of the War Department, serve under their commissions in the Coast and Geodetic Survey."

"Except as provided in section 2 of this order, the uniforms of male commissioned officers of the Public Health Service shall be the same as the uniforms now or hereafter prescribed for male commission..."

"In time of war, and at such other times as may be designated by the Surgeon General, all commissioned officers of the Public Health Service on active duty shall appear in uniform."

"Public Health Service insignia shall be substituted for SPAR insignia and headgear other than appropriate insignia of grade."