Index to Service Records, War with Spain, 1898
Navy Widows' Certificates, 1861-1910
National Homes for Disabled Volunteer Soldiers, 1866-1938
Online Spanish American War Records & Indexes
Remarried Widows Index to Pension Applications, 1887-1942 (covers service 1812-)
Veterans Administration Pension Payment Cards, 1907-1933 these must be browsed - primarily Civil War onward