File:US-O1 insignia.svgDescriptionUS-O1 insignia.svg English: Rank insignia for a Second lieutenant (US) Date 30 May 2006 Source Vectorized version of File:Second Lieutenant insignia.png
File:USCG O-1 3LT insignia.svgThis image is a derivative work of the following images: File:US_CG_O1_insignia.svg licensed with PD-USGov-Military-Badge 2008-01-15T03:33:40Z Ipankonin
File:US NOAA O1 insignia.svgrank insignia}} |Source=United States National Oceanic and Atmospheric Administration |Author=United States National Ocean File:US_Navy_O1_insignia.svg licensed
File:Captain insignia gold.svgThis image is a derivative work of the following images: File:US-O3_insignia.svg licensed with PD-USGov-Military-Badge 2008-01-26T08:10:29Z Ipankonin 534x500
File:US PHS O1 insignia.svginsignia}} |Source=United States Public Health Service |Author=United States Public Health Service |Date=11-30-2009 |Permission= |o File:US_Navy_O1_insignia