Table:
0
A
B
C
D
E
1
Name
Original name
Commissioned
Final decommission
Fate
2
USSChiwawa(AO-68)
Samoset
24 December 1942
6 May 1946
converted to laker, 1961; still in service
3
USSEnoree(AO-69)
Sachem
23 January 1943
22 October 1957
scrapped, 1982
4
USSEscalante(AO-70)
Shabonee
30 January 1943
12 December 1945
sunk, 1980
5
USSNeshanic(AO-71)
Marquette
13 March 1943
19 December 1945
converted to laker; still in service
6
USSNiobrara(AO-72)
Citadel
20 February 1943
12 November 1957
Scrapped after 1982

Questions and formulas:
Question: When was the ship that had a fate of 'converted to laker, 1961; still in service' commissioned?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="converted to laker, 1961; still in service"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,E2:E6="converted to laker, 1961; still in service"),3))
Level: medium
Question: When was the ship originally named sachem finally decommissioned?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="sachem"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,B2:B6="sachem"),4))
Level: medium