The first American astronauts insisted on the installation of an extra element to their spacecraft. What was it?

ejection seat
safety hatch
extra parachute
window
The Early prototype Mercury spacecraft had only two portholes, but the Mercury astronauts demanded a larger window to be installed, not only for the view but also for the orientation. The latter proved invaluable on their last mission, when instrument failure required visual orientation.
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Very interesting!
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Answers by country

ejection seat
safety hatch
extra parachute
window
answers
flagLebanon
0%
12%
6%
81%
16
flagGreece
0%
0%
21%
78%
14
flagSpain
9%
9%
9%
72%
11
flagRepublic of Ireland
19%
9%
4%
66%
21
flagthe United States
16%
10%
7%
61%
177
flagPoland
16%
10%
11%
60%
3446
flagthe Netherlands
20%
20%
0%
60%
15
flagthe United Kingdom
14%
9%
16%
58%
85
flagGermany
20%
12%
12%
56%
25
flagAustralia
13%
11%
16%
55%
36
flagCanada
25%
12%
4%
54%
24
flagthe Philippines
31%
18%
18%
31%
16
flagIndia
25%
22%
25%
23%
216
flagPakistan
14%
35%
28%
21%
14