1.  Marriage Record:

2.  1910 Census Index/Images (online at Genealogy.com; Image #1 of 4):  United States Ship Hopkins, Mare Island [Naval Yard], Solano Co., CA, Roll 1784 (Book 2), p. 80A, SN 1A, Line 1, ED 43, enumerated 1 Jun 1910 by James Laurence Kauffman, official enumeration date 15 Apr 1910 (extracted by Diana Gale Matthiesen):

1910:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).
3	4	5	6	7	8	12	13	14	17	18	20	23	24	26	28
Kauffman, James L.	Midir	M	W	23	S	OH	PA	OH	Eng	Officer	W	Y	Y	R	H

As the first man listed, our subject appears to be in command of this vessel.  All the men's ranks were abbreviated; I have no idea what the abbreviation "Midir" stands for (if, indeed, I read it correctly); our subject is the only man with that rank, whatever it is.  He was also the only man with "R" and "H" in Columns 26 and 28.  Was he the only man living ashore?

3a.  1920 Census Index/Images (online at Ancestry.com, Image #1 of 3; online at Genealogy.com, Image #1 of 3):  U.S.S. Barney, Port of Pensacola, Escambia Co., FL, USA, Roll 2040 (Book 2), p. 113A, SN 1A, Line 1, enumerated 2 Feb 1920, official enumeration date 1 Jan 1920 (extracted by Diana Gale Matthiesen):

1920 Naval/Military:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).
1	2	3	4	5	6	7	8	9	14	15	16	18	20	22	23
Kauffman James L	?? Commander ??	Md	Anapolis	217 Hanover St	M	W	32	M	Y	Y	OH	PA	OH	Y	Officer

As the first man listed, our subject appears to be in command of this vessel.  Some dodo wrote "Head R" over his rank, so it's hard to read.

NOTE:  how the enumerator managed to make two visits to 217 Hanover Street (appears to be an apartment building) and come up with two such different readings is beyond me.  This enumerator obviously had no idea how he was supposed to fill in the Street Numbers (Column 2), Dwelling Numbers (Column 3), and Family Numbers (Column 4).  He put the street numbers in Column 3, left Column 2 blank, and only sometimes filled in Column 4.

3b.  1920 Census Index/Images (online at Ancestry.com; Image #7 of 46):  217 Hanover St., Annapolis (Ward 1), Anne Arundel Co. (Dist. 6), MD, p. 4A, SN 4A, SD 4, ED 23, enumerated 6 Jan 1920, official enumeration date 1 Jan 1920 (extracted by Diana Gale Matthiesen):

1920:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).
1	3	5	6	9	10	11	12	17	18	19	21	23	25	26	27	28
*	217	Draper, Louise K.	Boarder	F	W	50	Wd	Y	Y	NY	NY	NY	Y	None
	217	Kauffman, James		M	W	32	M	Y	Y	OH	OH	OH		Naval Officer	At Sea	S
*Hanover St.

Louise K. DRAPER is almost certainly Elizabeth (DRAPER) KAUFFMAN's mother.

3c.  1920 Census Index/Images (online at Ancestry.com; Image #13 of 46 — indexed "Elizabeth O. Stauffmees"):  217 Hanover St., Annapolis (Ward 1), Anne Arundel Co. (Dist. 6), MD, p. 7A, SN 7A, SD 4, ED 23, enumerated 8 Jan 1920, official enumeration date 1 Jan 1920 (extracted by Diana Gale Matthiesen):

1920:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).
1	3	5	6	9	10	11	12	16	17	18	19	21	23	25	26
*	217	Kauffman Elizabeth D.	Boarder	F	W	32	M		Y	Y	NY	NY	NY	Y	Farmer
		________ Draper	Boarder	M	W	8	M	Y	Y	Y	CA	OH	NY	Y	None
*Hanover St.

4.  1930 Census Index/Images (online at Ancestry.com):  I found son, Draper (æ 19, b. CA), living at the U.S. Naval Academy in Annapolis, MD, but I can't seem to find his parents — and I really looked.

5.  SSDI:  Social Security Death Index (online at RootsWeb.com and Ancestry.com; missing columns contained no data):

Name	Birth	Death	Last Residence	Last Benefit	SSN	Issued
James KAUFFMAN	18 Apr 1887	Oct 1963	(District of Columbia)	(none specified)	193-26-0189	PA
Elizabeth KAUFFMAN	27 Oct 1887	Jan 1968	13052 (De Ruyter, Madison, NY)	(none specified)	083-24-8518	NY
Draper KAUFFMAN	04 Aug 1911	Aug 1979	32082 (Ponte Vedra Beach, Saint Johns, FL)	32082 (Ponte Vedra Beach, Saint Johns, FL)	112-12-0005	NY

6.  USS Kauffman (online at Thoralf Doehring's web site).